These numbers are over a decade old but still get cited in a lot of academic and government/think tank analyses of homelessness:
“…The idea that mental illness alone causes homelessness is naive and inaccurate, for two major reasons. First, the
overwhelming majority of those living with mental illness are not homeless (and studies have failed to demonstrate a causal relationship between the two).
These types of distortions can have dangerous implications, wrongly focusing the attention on the individual rather than on the institutions that perpetuate housing insecurity.
As a result, the illusory division between the “mentally ill homeless” and the “non-mentally ill homeless” casts the former as more deserving of intervention and services and the latter as seemingly “unworthy” or “undeserving” of support.
Though there is no causal relationship between mental illness and homelessness, those who suffer from housing insecurity are struggling significantly, both psychologically and emotionally. The constellation of economics, subsistence living, family breakdown, psychological deprivation and impoverished self-esteem all
contribute to the downward cycle of poverty.
According to the
Substance Abuse and Mental Health Services Administration (SAMHSA), in 2010, 26.2% of all sheltered persons who were homeless had a severe mental illness, and 34.7% of all sheltered adults who were homeless had chronic substance use issues.
Of those who experience chronic/long-term homelessness, approximately 30% have mental health conditions and 50% have co-occurring substance use problems.
Also, they typically endure traumatic experiences that could potentially lead to mental health struggles, and certain environmental factors may increase the likelihood that they encounter future traumas.
More than 92% of mothers who are homeless have experienced severe physical and/or sexual abuse during their lifetime, and about two-thirds of homeless mothers have histories of domestic violence.
Mothers who are homeless have three times the rate of PTSD and twice the rate of drug and alcohol dependence of their low-income housed counterparts. Left untreated, these stressors can further damage their mental health, potentially triggering maladaptive coping and putting them at risk for future traumatic events. …”
www.menningerclinic.org