[Homelessness and mental illnesses].

Homelessness is an expression of marked social exclusion phenomena and often particularly affects people with mental disorders. Mental disorders often precede the onset of homelessness but can also be a result of homelessness. Different forms of therapeutic and social support interventions have been evaluated in various countries, predominantly with an outreach treatment approach. These interventions were often combined with low threshold availability of housing programs. These showed positive effects on housing stability and reduction of psychiatric symptoms but not in reduction of substance use disorders. Peer support strategies and the use of digital media are possible options for future therapeutic strategies.