Risk factors lead to social exclusion and their accumulation can lead to homelessness. This inevitably contributes to a progressive increase in psychological distress or aggravates a pre-existing mental illness. Over the years, homeless people, who are never happy, develop various survival strategies and mental defenses that can sometimes prove effective. Other individuals who are less"adapted" to living in the street may suffer from both mental and physical collapse. Proactive programs designed to facilitate access to healthcare and welfare have been created in order to offer solutions designed to enable homeless people to leave the street, through access to medical care, accommodation and civil rights. The psychiatric sector has been slow to adapt to the needs of this population, although several teams specializing in mental illness and precariousness have been created These teams explore every possible avenue to help homeless people with mental health issues to recover a psychological balance that allows them to choose a recovery pathway and thus to regain a dignified lifestyle.