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Homelessness is a mental health problem in almost Western countries. The purpose of this communication is to update the
knowledge about the psychopathology of these public using current diagnostic criteria including the tools proposed by the DSM
5 for clinical and personality disorders. These results will be discussed in light of previous outcomes both on general and homeless
populations, especially in terms of dual diagnosis. People who are dually diagnosed with severe mental illness and substance use
disorders constitute 10%-20% of homeless persons. They are a heterogeneous and extremely vulnerable subgroup with complex,
poorly understood needs. In this article recent research on the epidemiology, subject characteristics, and service needs of the dually
diagnosed homeless population is reviewed. Also, the range of evolving approaches to providing social services, housing, and mental
health and substance-abuse treatments; the relevant system issues and legal issues; and problems with current research, as well as
future research directions, are discussed. The importance of the distinction between providing appropriate living environments and
mental health treatments emerges throughout.