According to a 2015 assessment by the U.S. Department of Housing and Urban Development, 564,708 people were homeless on a given night in the United States. At a minimum, 140,000 or 25 percent of these people were seriously mentally ill, and 250,000 or 45 percent had any mental illness. By comparison, a 2016 study found that 4.2 percent of U.S. adults have been diagnosed with a serious mental illness.
Affective disorders such as depression and bipolar disorder, schizophrenia, anxiety disorders and substance abuse disorders are among the most common types of mental illness in the homeless population.
Most researchers agree that the connection between homelessness and mental illness is a complicated, two-way relationship. An individual’s mental illness may lead to cognitive and behavioral problems that make it difficult to earn a stable income or to carry out daily activities in ways that encourage stable housing. Several studies have shown, however, that individuals with mental illnesses often find themselves homeless primarily as the result of poverty and a lack of low-income housing. The combination of mental illness and homelessness also can lead to other factors such as increased levels of alcohol and drug abuse and violent victimization that reinforce the connection between health and homelessness.
Studies do show that homelessness can be a traumatic event that influences a person’s symptoms of mental illness. Having ever been homeless and the time spent homeless can be related to higher levels of psychiatric distress, higher levels of alcohol use and lower levels of perceived recovery in people with previous mental illness.
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