Childhood maltreatment (CM) is linked to impairments in various domains of social functioning. Here, we argue that it is critical to identify factors that underlie impaired social functioning as well as processes that mediate the beneficial health effects of positive relationships in individuals exposed to CM. Key research recommendations are presented, focusing on: (1) identifying attachment-related alterations in specific inter- and intrapersonal processes (e.g., regulation of closeness and distance) that underlie problems in broader domains of social functioning (e.g., lack of perceived social support) in individuals affected by CM; (2) identifying internal (e.g., current emotional state) and external situational factors (e.g., cultural factors, presence of close others) that modulate alterations in specific social processes; and (3) identifying mechanisms that explain the positive health effects of intact social functioning. Methodological recommendations include: (1) assessing social processes through interactive and (close to) real-life assessments inside and outside the laboratory; (2) adopting an interdisciplinary, lifespan perspective to assess social processes, using multi-method assessments; (3) establishing global research collaborations to account for cultural influences on social processes and enable replications across laboratories and countries. The proposed line of research will contribute to globally develop and refine interventions that prevent CM and further positive relationships, which – likely through buffering the effects of chronic stress and corresponding allostatic load – foster resilience and improve mental and physical health, thereby reducing personal suffering and the societal and economic costs of CM and its consequences. Interventions targeting euthymia and psychological well-being are promising therapeutic concepts in this context.

Childhood maltreatment (CM) includes all types of physical and/or emotional ill-treatment, sexual abuse, neglect, and exploitation, which result in actual or potential harm to the child’s health, survival, development, or dignity in the context of a relationship of responsibility, trust, or power [1]. Prevalence rates depend on gender and vary across continents from 6 to 61% (emotional abuse), 22 to 60% (physical abuse), 6 to 27% (sexual abuse), and 17 to 65% (neglect) [2]. There is a well-documented link between CM and poor mental and physical health [3]. Moreover, there is a large body of evidence related to neurobiological changes stemming from CM, including genetic factors and epigenetic processes [4, 5]. Here, however, we argue that in addition to understanding, preventing, and treating the mental and physical consequences of CM, it is equally critical to understand and strengthen affected individuals’ social functioning (i.e., their ability to interact with others and to fulfill social roles during daily work and leisure-related activities with family members, colleagues, friends, and partners). We provide an overview of the mental and physical health consequences of CM and summarize the detrimental effects of CM on a broad range of domains of social functioning as well as the protective, health-promoting effects of social relationships (see Fig. 1). We argue that to advance the field and develop effective interventions that strengthen social functioning in individuals with a history of CM, future research needs to focus on identifying factors that underlie impaired social functioning and on the processes that mediate the positive health effects of intact social functioning in individuals exposed to CM. We propose a conceptual framework of key factors and processes linking CM to mental health, physical health, and social functioning (Fig. 1), and specific recommendations (Table 1) and methodological considerations (Table 2) for future research. Finally, intervention approaches to improve social functioning in the context of CM are discussed.

Table 1.

Specific recommendations

Specific recommendations
Specific recommendations
Table 2.

Methodological considerations

Methodological considerations
Methodological considerations
Fig. 1.

Conceptual framework, illustrating the known associations between CM, mental health, physical health, and social functioning, and putative factors associated with CM, mental health, physical health, and social functioning. Positive associations are marked with (+); negative associations are marked with (–); dashed lines represent moderator effects.

Fig. 1.

Conceptual framework, illustrating the known associations between CM, mental health, physical health, and social functioning, and putative factors associated with CM, mental health, physical health, and social functioning. Positive associations are marked with (+); negative associations are marked with (–); dashed lines represent moderator effects.

Close modal

CM is associated with a significantly increased risk of mental disorders during childhood, including posttraumatic stress disorder (PTSD), psychotic disorders, attention-deficit/hyperactivity disorder, anxiety, and depressive disorders [6, 7]. CM is also a significant risk factor for mental disorders in adolescence, and is associated with impaired mental health and dissociative symptoms in severe mental disorders such as schizophrenia, bipolar disorder, and personality disorders in adulthood [8].

In low- and high-income countries, women exposed to CM are at increased risk of developing postpartum depression [9], which in turn increases the risk of impaired maternal-child attachment [10] and depression in the child [11]. CM is also associated with increased risk of subclinical hypothyroidism in pregnancy [12]. Furthermore, potential associations between maternal exposure to CM, fetal brain development [13], brain anatomy [14], and obesity in the newborn [15] are well documented. Moreover, children exposed to CM are at risk for asthma, sleep disruptions, somatic complaints such as headache and nausea, and recurrent infectious diseases requiring hospitalization [16].

CM is also consistently related to poor long-term physical health (diabetes, chronic pain, obesity) and problematic health behaviors (physical inactivity, smoking, increased suicidal behavior, poor sexual health, risky sexual behaviors) [3, 17-19]. Furthermore, there is a well-documented risk for substance abuse and corresponding disorders in both children and adults exposed to CM [20]. Consistent with these findings, older adults who have experienced multiple types of CM have nearly twice the risk of premature mortality compared to unexposed older adults [21].

Figure 1 illustrates the effect of CM on mental and physical health. In line with the long-lasting effects of CM, differences in brain structures involved in the regulation of emotion and stress between CM and non-CM groups are well documented [22]. Differences in developmental timing (which refers to when CM occurs in relation to critical and sensitive periods of the nervous system and body development [23, 24]) have been linked to different brain structural volume [25], physiological and cognitive outcomes [26, 27]. CM experiences that span several developmental periods, including both early and later childhood stages, predict a cascade of internalizing and externalizing symptoms in childhood that eventuate in greater symptoms of anxiety, depression, substance use disorder, and antisocial personality disorder in emerging adulthood [28].

In this context, the concept of allostatic load [29] is important. Responding to stress requires activation of multiple neurobiological processes which, while adaptive, also contribute to allostatic load – the physical “wear and tear” that accumulates as a consequence of recurrent or chronic activation of neural and physiological regulatory systems. Increased allostatic load due to chronic stress is held to be a key etiological mechanism in the pathway from CM to disease [30], with longitudinal evidence showing that CM predicts allostatic load in adulthood [31], and emerging evidence that allostatic load mediates the influence of CM on adult depression [32] (see Fig. 1). In line with the many health-related consequences of CM, the overall economic consequences of CM are substantial. In the US, the average estimated lifetime cost is USD 830,928, while the estimated annual population lifetime burden of CM is USD 428 billion [33].

We propose that in the context of CM positive social relationships can prevent CM and contribute to mental and physical well-being in several ways. First, children of parents with a history of CM are more likely to be exposed to maltreatment [34]. However, between 12 and 93% of parents exposed to CM succeed in breaking this intergenerational cycle of maltreatment [35]. One factor that seems to have a preventive effect is intact social functioning; positive and supportive relationships between affected parents and other adults (e.g., romantic partners, co-parents) are linked to a lower risk for intergenerational continuity of CM [35]. That is, intact social functioning can prevent CM in the next generation (Fig. 1).

Second, positive social relationships can moderate the relationship between CM and health problems (see Fig. 1), protecting individuals exposed to CM from developing health problems. In support of this claim, for child and adult populations exposed to trauma including CM, perceived social support (i.e., warm and caring relationships with parents, other family members, peers, colleagues, friends, spouses, school personnel, or health providers) is one of the most consistently identified resilience factors, protecting against the development of trauma-related [36] and other mental disorders [37].

Third, intact social functioning can have a direct positive impact on mental and physical health. The more individuals feel positively connected to and supported by others, the lower their risk for mental and cardiovascular disorders, impaired cognitive functioning, dementia, obesity, mortality, alcohol abuse, and other risky health behaviors [38, 39] (Fig. 1). In sum, there is evidence that positive social relationships can serve as key protective factor for CM and associated adverse health outcomes.

While positive social relationships may bring key benefits to CM survivors and subsequent generations, individuals exposed to CM may be less well equipped than others to access such support. Individuals with a history of CM show well-documented impairments in many domains of social functioning (Fig. 1). In children, CM has been linked to increased social isolation and withdrawal [40], perceived impairments in social competence and emotional intelligence [40, 41], and increased risk of bullying and victimization [42]. Furthermore, maltreated children were reported to be less well-liked and more likely to experience rejection by their peers than their non-maltreated counterparts [43]. The link between CM and social dysfunctioning seems to persist into adulthood. For example, adults with a documented history of CM report less positive perceptions of their romantic relationships, higher rates of separation, divorce, and problematic parenting behaviors, and a greater likelihood of involvement in intimate partner aggression and violence than matched controls (e.g., [44-47]). While much of the research focuses on consequences of CM for intimate partner relationships, particularly amongst women exposed to child sexual abuse, prostitution, rape, and early marriage [48], social difficulties extend beyond intimate relationships, with CM being linked to increased family conflict [47], less adaptive social relationships [46], reduced perceptions of social support from family and friends [49], and increased perceptions of loneliness and social isolation [50]. Negative evaluations (low levels of perceived trustworthiness and likeability by unknown others) also seem to persist into adulthood [51].

Factors that might moderate the relationship between CM and social functioning are the type of CM and age at onset of CM. It has been proposed that early experiences of threat (e.g., physical exposure) and deprivation (e.g., neglect) impact different neural circuits [52] which, in turn, differentially impact cognitive functions [53], learning, and behavior [54, 55]. Such differential effects might affect not only mental and physical health, but also the development of social functioning. Furthermore, neglected children show more pronounced academic deficits and social withdrawal as well as lower peer acceptance than physically abused children, with exposure to neglect prior to kindergarten having a particularly pervasive influence on school achievement [56]. The setting in which CM is experienced may also affect social functioning. Yet, while emotional and sexual abuse in foster care settings are known to have negative effects on adult survivors’ mental health [57], studies evaluating differences in social functioning in individuals with institutional versus intrafamilial CM or looking specifically at CM occurring in other non-familial settings, are lacking.

Despite extensive evidence demonstrating significant social dysfunction in children and adults exposed to CM, there is limited knowledge on more specific processes and mechanisms that underlie broader social problems, and on factors that mediate the positive effects of intact social functioning on mental and physical health. This, in turn, limits the capacity to develop effective preventative and therapeutic interventions. We therefore propose that future research focuses on identifying the specific processes that contribute to broader social problems as well as on processes that mediate the relationship between intact social functioning and mental and physical health (Fig. 1). In the following sections, we outline specific aims (summarized in Table 1) and methods (summarized in Table 2) for such research.

Identification of Key Interpersonal and Intrapersonal Socially Relevant Processes Affected by CM

The Role of Attachment

One key process already well known to be affected by CM is a child’s ability to build secure and enduring relationships with their caregivers [58]. As proposed by attachment theory, a person’s early interactions and relationships with their primary caregivers shape later attachment behavior [59]. A person’s attachment style (i.e., behavioral tendencies and preferences that define the degree to which someone avoids or seeks attachment experiences) seems to be relatively stable across the lifespan [60] and affects the perceived quality of relationships with peers, romantic partners, and even children [61]. There is evidence for a strong relationship between CM and insecure attachment [62], and attachment difficulties, in turn, are linked to broad socio-interpersonal problems (in disclosure, social support, and acknowledgment) in adulthood. We propose that alterations in specific socially relevant processes mediate the relationship between attachment difficulties and impaired social functioning, including revictimization [48, 63], which should be tested in future research (Fig. 1).

In attempting to identify the specific processes that underlie the above-described broad problems in social functioning it thus seems promising to assess processes that are likely to be influenced by attachment difficulties (Fig. 1). However, claims of attachment theory, including the conceptualization of different attachment styles, are based on a Western child-rearing philosophy, which focuses on mother-infant attachment and emphasizes the development of personal autonomy. In its present form, attachment theory is thus not applicable to other cultures (e.g., [64]). When investigating effects of CM on attachment styles and how they impact specific social processes, it is thus necessary to apply (and, where necessary, first develop) attachment-related concepts that reflect cultural variation.

Processes Known to Be Affected by CM

Some of the socially relevant processes known to be affected by CM (Fig. 1) have been documented. For instance, CM is linked to heightened emotional reactivity and problems in emotion regulation [65]. Furthermore, CM has been linked to alterations in the perception and interpretation of emotional [66, 67] and neutral facial expressions [68-70]. Children exposed to CM tend to perceive neutral expressions as more similar to negative emotional expressions [70]. Similarly, adults with (vs. without) histories of CM more frequently interpret neutral expressions as feelings of anger, sadness, fear, and contempt [68, 69]. This suggests that the negativity bias observed in children may persist throughout the life course. There is also less consistent evidence that children exposed to CM show diminished cognitive understanding of other individuals’ mental states [71], with some of these effects persisting into adulthood [72] and impairments being more pronounced with exposure to CM across a greater number of time periods [73]. Furthermore, it has been reported that sexually abused children, especially those exposed to intrafamiliar sexual abuse, have greater difficulties in mentalizing [74]. Finally, revictimized women with a history of childhood sexual and physical abuse were found to perceive photographs of males with stronger implicit facial cues of aggressiveness as more attractive than revictimized women without such a history, identifying a social processing bias that could increase risk for future victimizing relationships [75].

Processes to Be Targeted by Future Research

Further research aimed at identifying processes that are likely affected by attachment difficulties (Fig. 1) should, i.a., focus on problems in the regulation of closeness and distance which might contribute to partnership conflict and reduced sexual and relationship satisfaction. It has recently been proposed that based on learning history, individuals exposed to CM show abnormal neural responses to social signals, such as facial expressions [76] or the perception of touch [77], which might result in discomfort in situations of physical proximity, and a preference for larger interpersonal distances [77-79]. In addition, future studies should try to identify alterations in communicative processes and behaviors that contribute to negative evaluation by others [51]. For example, non-verbal signals (e.g., body posture, facial expressions, and expressions of emotions in the voice) might induce cognitive, affective, and behavioral responses in interaction partners, affecting the quality of interactions and making it difficult to build and maintain social relationships [80]. Moreover, interpersonal processes such as (culture-dependent) interpersonal emotion regulation, shared social identities, group memberships, and social identity management have received increased attention in basic emotion science and social psychology research in recent years [81, 82] and might be of importance for the field of traumatic stress, including CM.

Identifying Modulating Factors

Various factors (e.g., social context, pre-existing mental disorders) may affect the degree to which alterations in specific social processes are present in a specific situation. That is, alterations in specific social processes might vary both within and between individuals affected by CM. It is therefore crucial to identify factors that determine whether and to what degree specific social processes are adversely affected by CM. In addition to socio-cultural factors, negative interpretations of non-verbal signals (e.g., facial expressions) might occur in some but not in other situations. For example, individuals affected by CM might display negative interpretations which activate negative schemas in interpersonal situations with strangers [83] but not in the real (or imagined) presence of trusted, close others [84]. Similarly, preferred interpersonal distances might vary within individuals. That is, a person who has experienced CM may alternate between preferring close proximity and larger distances, depending on their current cognitive, emotional, and motivational state, and on the person they interact with [78]. In addition, potential compensatory mechanisms should be explored. That is, potentially harmful alterations in specific social processes (e.g., in understanding non-verbal emotional signals) might be compensated by other skills (e.g., by the ability to interpret what another person says explicitly). In sum, research should explore internal (e.g., an individual’s current emotional state, personal resources in the form of compensatory mechanisms) and external factors (e.g., social context, cultural factors) that enhance or buffer alterations in social processes (Fig. 1).

It is essential to establish the extent to which alterations in specific socially relevant skills and processes in individuals who have experienced CM underpin broader problems in social functioning (Fig. 1). It seems likely that deficits in socio-emotional and socio-cognitive skills lead to problems in interpersonal interactions, which may, in turn, be related to a lower perceived quality of relationships (as one aspect of social functioning). For example, the ability to read others’ emotions helps us to infer their current affective state, thoughts, and intentions. Based on this information, people can modulate their own behavior, and – through responsive, trust-building actions – bond with other individuals or groups [85]. In non-clinical populations, adequate perception of others’ emotions has in fact been linked to relationship satisfaction [86-88]. However, the presence and direction of this link depends on the sex of relationship partners [86] and on the type of emotions [88].

The few studies that have assessed whether alterations in specific social processes are related to broader social problems in individuals affected by CM suggest that poor emotion regulation skills (including difficulties with emotional awareness [89]), maladaptive internalized schemas [90], and women’s and their partner’s accuracy in reading their partner’s negative emotions [87] mediate the association between CM and relationship satisfaction. Research in this field needs to replicate these initial findings and explore whether other social processes known to be affected by CM, such as negative interpretations of facial expressions, larger preferred interpersonal distances, negative judgments by others, or the perception of aggressive photographed men as attractive [43, 51, 68, 69, 75, 77-79], have a negative impact on relationship satisfaction and other aspects of social functioning known to be affected by CM (Fig. 1). Moreover, whether these findings from non-clinical populations apply to individuals affected by CM with mental disorders is deserving of investigation. Relatedly, it is important to investigate whether effects are driven by CM or by associated psychopathology (e.g., PTSD and depression). Future research should thus use study designs as well as statistical methods that allow the dissociation of these effects [e.g., 69].

The factors that mediate the effects of intact social functioning on mental and physical health are not well understood. There is evidence that the relationship between CM and allostatic load, as measured by indices of hypothalamic-pituitary-adrenal axis, neuroendocrine, immune, and sympathetic nervous system activation, is partially mediated by poor social support [91]. This suggests that supportive social relationships exert a positive effect on mental and physical well-being at least in part, by buffering the effects of chronic stress (CM) on allostatic load (see Fig. 1). However, evidence in this area is extremely limited and further research is urgently needed to elucidate the biological pathways via which social support may benefit individuals exposed to CM. Moreover, due to the lack of causal evidence in this field, it is hard to infer clear conclusions as to whether impaired social skills cause mental health and adverse outcomes, or whether mental disorders impair social functioning, or both.

Assessing Social Processes Inside and Outside the Laboratory

Assessment of social processes requires laboratory studies conducted under controlled conditions, allowing for systematic variation of the factors of interest and control of confounding variables. Current research conducted in the laboratory frequently relies on experimental stimuli that differ strongly from social stimuli outside the laboratory [92]. For instance, pictures of facial expressions are used to assess emotion recognition [66] and computerized tasks are used to assess preferred interpersonal distance (e.g., [93]). These approaches allow one to standardize characteristics of social stimuli (e.g., the intensity of a facial expression or the exact interpersonal distance), yet they limit the conclusions that can be made regarding participants’ behavior in real-life. While this is a general drawback of standardized experimental stimuli, it seems particularly important that socially relevant processes are also examined as they occur naturally. Next to observing relevant phenomena outside the laboratory, this can be achieved by developing and applying more non-standardized or partially standardized interactive experimental paradigms that allow for the assessment of social processes under real or close to real-life conditions. For example, couples or other interaction partners can be brought to the laboratory to discuss a topic (e.g., [94]) while being filmed (e.g., [95]), allowing for high ecological validity and generalizability and, at the same time, control of the environment and content of the interaction. Also, the use of virtual reality environments might help establish close to real-life settings under controlled conditions, for example when assessing whether preferred interpersonal distances are affected by the approaching person’s facial expression [96].

Adopting Longitudinal and Multi-Method Assessments in an Interdisciplinary Context

Consistent with allostatic load incurred by chronic stress, CM produces “biological scars” [97] that have a bearing on premature aging in later adult years and that accelerate biological aging in adults with mood and anxiety disorders through processes such as epigenetic aging and telomere attrition [98]. In turn, increased satisfaction with social ties [99] and more positive and prosocial emotions in social situations [100] are linked to healthy aging (Fig. 1). Currently, there is a dearth of evidence on the impact of CM on relational-affective processes and social functioning in older adults. As relationship and affective domains are dynamic over the lifespan, repeated longitudinal measurements are needed to map these domains to mental and physical health trajectories [101] and to assess how both socially important impairments and skills develop, interact, and predict the quality of social relationships over time.

Furthermore, assessing social processes requires multi-method approaches. While retrospective self-report measures are prone to memory biases and show limited ecological validity, ecological momentary assessment (EMA; repeated real-time sampling of behaviors and experiences in their natural environment) overcomes these limitations and enables the study of socially relevant microprocesses with different interaction partners [102]. Nonetheless, effects of social desirability can distort self-report measures, including EMA. Thus, incorporation of behavioral or psychophysiological assessments can provide a crucial validation of findings based on self-report [103]. Even seemingly simple processes such as the perception of a facial expression comprise various cognitive and emotional processes that mutually impact one another and interplay with neuronal [104], peripheral physiological [105], hormonal [106], cultural [107], and genetic factors [5, 7].

Methodologically sound research, including multi-method measurements, thus requires professionals from different disciplines and with specific background knowledge and experience (ranging from animal research to developmental psychology and computer science). Many socially relevant skills and processes are not yet fully understood in normally developing individuals. For example, the role of automatic imitation of facial expressions in facial emotion recognition [108] and the biological (e.g., endocrinological) factors that determine how close we prefer to stand to someone [93, 96] still need to be understood in a comprehensive way. Equally, the concept of allostatic load provides a key biological framework through which the links between stress, mental health, and physical health can be understood. It is thus important to seek collaborations with basic science researchers to understand socially relevant processes in the general population, and to ensure that research in CM reflects the state of the art in the field with respect to methodological approaches (Table 2).

When assessing social processes and related concepts, it is essential to account for cultural factors which shape social perception and functioning [109]. For example, decades of research underscore the importance of cultural differences in the expression, perception, response to, and appraisal of emotion [e.g., 107]. Furthermore, collectivistic cultural groups (e.g., Asian cultures) engage more strongly in interpersonal emotion regulation strategies than individualistic cultural groups (e.g., North American cultures) [82], and higher interdependence predicts higher well-being in Japan while higher independence predicts higher levels of well-being and health in the USA [110]. Culture also affects which emotion regulation strategies are deemed beneficial, including in the aftermath of trauma [111]. Moreover, culture influences the effectiveness of close relationships and social support following exposure to life stressors [112]. Thus, cultural differences have applicability in the area of psychotraumatology [113] and need to be considered in research on CM and social functioning.

When focusing on the cultural milieu, it is important to recognize how beliefs and values may be internalized differently between distinct ethnic groups in a culture and different cultures within a single ethnic group, as well as the intragroup differences present in both cases [114]. To broaden our understanding of how cultural factors impact the relationship between CM and socially relevant processes, cross-national research collaborations [115], including researchers from currently underrepresented countries, are needed. This will allow for replication across countries and strengthen the reliability and generalizability of findings.

Although capturing cultural and ethnic variables and parsing them out from intragroup effects is a complex long-term undertaking, the development of sound psychometric assessment tools through standardized translation and back-translation procedures is an important basic step for cross-cultural collaboration. Collaborative groups should also consider joint development of new psychometric tools and experimental assessment paradigms that are suitable for diverse cultural and ethnic groups. When translating existing and developing new self-report scales, clinimetric selection criteria should be considered, next to applying traditional psychometric criteria [116]. The clinimetric approach focuses on the clinical utility of self-report measures, while disregarding other (traditional psychometric) criteria such as the unidimensionality of “to-be-assessed” constructs [116].

Existing interventions that aim to diminish or prevent CM in at-risk families focus on parenting skills and social support (e.g., through home visitations, parent training, or multisystemic interventions) [117] as well as psychoeducational group interventions (e.g., [118]), training in emotionally supportive parent-child communication [119], and psychotherapeutic approaches that target social functioning in populations exposed to CM [120]. However, there is still a need for specific interventions that directly target social functioning in victims of CM [77, 121]. Training of social problem-solving skills has shown benefits for emotional problems, interpersonal communication, and assertiveness in traumatized youth in residential settings [122]. Furthermore, Skills Training in Affective and Interpersonal Regulation (STAIR), which encompasses strategies for changing relationship patterns and becoming closer to others, showed promising results in women with PTSD related to CM [123].

As major steps of socio-emotional development, including the development of attachment relationships, take place in early childhood [124], interventions to further social functioning should be applied as early as possible to reduce long-term risk for impaired social functioning, and consequently poor mental health [125]. Nonetheless, given the pervasive and chronic nature of CM [126], it seems unlikely that isolated interventions to improve social functioning will be sufficient to address the complex problems arising from CM. During later developmental stages and adulthood, when mental health problems may have become chronic, approaches that focus on symptoms of mental health problems could be beneficial. In this respect, interventions that target social functioning might also benefit interactions with health care providers, which is important considering the significance of the quality of the therapeutic relationship for therapy completion and outcome [127], and the barriers that difficulties in social skills could present to establishing a strong therapeutic partnership [128].

In summary, a range of interventions that include a focus on social relationships or processes have been tested, but we still have limited understanding of what elements of social functioning should be targeted through intervention to benefit well-being among those exposed to CM. A key question to be addressed is whether social processes related to social functioning should be worked on directly (e.g., in the form of emotion recognition training) and/or whether such processes can also be changed indirectly, for example through establishing a positive relationship with the therapist [129] or by working on maladaptive relational schemas [83].

The focus of interventions for CM to date has been on preventing or addressing negative outcomes, particularly a lack of significant symptoms. However, it has been argued that the presence of positive affect and psychological well-being should also be considered important therapeutic outcomes, in line with the concept of euthymia [130]. Euthymia is a transdiagnostic construct that shifts the focus away from specific disorder symptoms, which is potentially relevant to CM given its links to varied mental disorders. Well-being therapy [131] focuses explicitly on positive relationships, alongside other components of psychological well-being, in order to achieve a state of euthymia [132, 133]. Well-being therapy is typically combined with cognitive behavioral approaches and has yielded positive effects in patients with mood and anxiety disorders [134]. Other euthymia-oriented interventions such as mindfulness-based cognitive therapy [135] and acceptance and commitment therapy [136] have also shown positive effects, e.g., on rates of relapse and psychological well-being, in patients suffering from anxiety, depression, and chronic pain [137, 138]. Interventions pursuing social functioning but also euthymia more broadly might thus help individuals affected by CM to maintain well-being and to build healthy relationships and a sense of belonging, even when faced with recurrent and chronic health problems.

The lines of research proposed will expand the knowledge base needed to globally develop and implement preventive measures that counteract both the occurrence of CM and its adverse effects. Understanding the effects of CM on social functioning, and contributory cultural and ethnic influences, will advance the development (and assessment of effectiveness) of novel interventions and the refinement of existing interventions to strengthen social functioning. Given the major individual, societal, and economic costs of CM, improving social functioning in the context of CM is relevant not only for an individual’s personal health and well-being, but also from public health (i.e., informing communities and raising awareness of CM) and economic perspectives.

The authors have no conflicts of interest to declare.

The preparation of this manuscript was supported by two grants from the Swiss National Science Foundation (S-86403-02 and 10001C_185356) to Monique C. Pfaltz. Natalia E. Fares-Otero was supported by CIBERSAM: Biomedical Research Networking Center for Mental Health Network, Spain, and by a scholarship provided by the German Academic Exchange Service DAAD: Deutscher Akademischer Austauschdienst (91629413).

All authors contributed to the conception of the work as part of regular discussion within the framework of the Global Collaboration on Traumatic Stress (www.global-psychotrauma.net), socio-emotional development across cultures subtheme (www.global-psychotrauma.net/socio-emotional-development). M.P., S.H., S.S., U.S., M.R.S., and S.H.N. wrote the first draft. All authors contributed substantially to the revision of the first draft. M.P., N.E.F.-O., S.H., S.S., U.S., S.H.N., and M.R.S. revised the manuscript. All authors approved the final version of the submitted manuscript.

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