Scholars, healthcare workers, and homeless advocates agree that two major contributing factors are poverty and a lack of affordable housing, both stubbornly intractable societal challenges. But they add that hard-to-treat psychiatric issues and substance-use disorders also often underlie chronic homelessness. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.