Interpersonal relationships are among the most important components of mental health and satisfaction. The ability to enter into and maintain these relationships is regarded as a key competency within the framework of mental health.
Due to the high number of urban dwellers, the city offers many opportunities to build and enjoy interpersonal relationships. Numerous studies have shown that a balanced social network is a protective factor against mental and physical disorders. It is assumed that the adversaries of social inclusion – social loneliness or social isolation – are significant components of pathogenic social urban stress.
Social loneliness is initially the subjective, stressful feeling (emotional pain) of being alone in life (the absence of a sense of belonging). It is objectified by the discrepancy between the actual and the personally desired degree of social inclusion. This varies from one individual to the next. It can also be understood as a biological deficiency signal, which is intended to alert or prompt the person concerned to act in order to ensure their survival.
Social isolation, on the other hand, is an objectifiable lack of friends and confidants, characterised by a lack of communication and active participation in social life. Social exclusion resulting from being socially or psychologically different is regarded as a serious and intensive type of social isolation. Many studies and meta-analyses have convincingly shown that both phenomena are associated with significantly adverse health effects and increased mortality (e.g. high blood pressure, increased blood lipids, immunodeficiency, sleep disorders, smoking).