Homelessness, Its Consequences, and Its Causes

Posted on: February 28, 2016 Topics: dean's note, homelessness

deansnote1Homelessness has been quite visible in our community over the past year, particularly after the Long Island Bridge closing, which left more than 400 people overnight without a place to live. Various services across the city have stepped up to take care of this population, including new shelters and the Boston Health Care for the Homeless Program. We hosted a Dean’s Seminar on the topic in September featuring Jim O’Connell, who has spent a lifetime delivering health to the homeless in Boston. Today a few thoughts on homelessness, its health consequences, and its causes.

The US Department of Housing and Urban Development conducts an annual count of homeless people in the US, and found an average of 564,708 people living on the streets per night in January 2015. This number has declined overall in the past few years (651,142 people were homeless in 2007), but has increased in various places, importantly in New York City, where about 14 percent of the national homeless population resides. Figure 1 below shows changes in homelessness nationally over the past two years.

Figure 1. Change in overall homelessness 2013–2014.

Figure 1. Change in overall homelessness 2013–2014.
The state of homelessness in America 2015. http://www.endhomelessness.org/library/entry/the-state-of-homelessness-in-america-2015

The majority of homeless people are only considered homeless for a short time, but a sub-population of the homeless are chronically homeless for 30 to 40 years. In last year’s count, 83,170 individuals and 13,105 people in families with children nationwide had either been continuously homeless for a year, or experienced at least four episodes of homelessness in the last three years. Furthermore, 36 percent of all homeless individuals were part of families with children. This is shown in Figure 2.

Figure 2. Homeless population by household type and sheltered status, 2015.

Figure 2. Homeless population by household type and sheltered status, 2015.
The 2015 Annual Homeless Assessment Report to Congress. The US Department of Housing and Urban Development Office of Community Planning and Development. November 2015. PART 1: Point-in-Time Estimates of Homelessness. https://www.hudexchange.info/resources/documents/2015-AHAR-Part-1.pdf

There is abundant evidence about the health consequences of homelessness. At a fundamental level, the homeless have higher premature mortality than those who are appropriately housed, with injuries, unintentional overdose, and extreme weather events being important drivers of this mortality. The homeless also have poor quality of life, characterized, as noted in various studies, by chronic pain associated with poor sleeping conditions and limited access to medications and other salutary resources. Skin and foot problems, dental problems, and chronic infectious diseases are also well-described among homeless populations. For a comprehensive review of the health of the homeless, I would refer to this published work.

The intractability of homelessness—we all know that homelessness is a challenge, and that it threatens health—presents challenges both to how we think of homelessness and its consequences, and how we might envision solutions. Perhaps one useful frame is to consider homelessness across the lifecourse, by way of highlighting the factors that are coincident with, and contribute to, homelessness.

Twenty-three percent of the homeless population in the US is under the age of 18. Homeless youth are especially vulnerable to drug use; one study found that 55 percent of street youth and 34 percent of shelter youth have used illicit drugs since leaving home, compared to 13 percent of youth who’ve never been homeless.

Importantly, and signaling one of the central contributors to homelessness, a sample of homeless adolescents in Los Angeles showed that 32 percent reported a need for help with mental health problems and 15 percent met criteria for emotional distress. The proportion of those with emotional distress was higher among gay, lesbian, or bisexual youth as well as black youth. It has been estimated that roughly three times as many homeless adolescents suffer from depression compared to other adolescents. Homeless adolescents are also likely to experience violence: 21 percent to 42 percent report sexual abuse, compared to 1 percent to 3 percent of the general population, and about 40 percent have reported being assaulted with a weapon. About 40 percent identify as LGBT.

As with youth, homeless adults are also at greater risk of substance use disorders and overdose compared with the general population. They are also very likely to smoke tobacco. Homeless adults are disproportionately affected by psychiatric disorders, though it is difficult to estimate the true burden among this population, considering they are usually excluded from national surveys. Homeless people with mental illnesses tend to have less contact with family or friends and are more likely to remain homeless for a longer time period.

Older individuals are at risk of being homeless later in life due to lack of income. Specifically, those younger than 65 years old who do not yet receive Medicare or social security benefits and are unemployed may be especially vulnerable. Additionally, older veterans make up a large portion of the homeless population, although the proportion of veterans who are homeless has decreased since 2009. In January 2015, 47,725 veterans were considered homeless on a given night.

Therefore, homelessness is overwhelmingly coincident with socioeconomic vulnerability and with poor behavioral health, both mental illness and substance use. Which leads to the approach we might consider taking to mitigate the consequences of homelessness. Much of the literature in the area suggests that interventions that provide case management for substance use and mental illness and critical time intervention approaches to mitigate the consequences of acute stressors can be effective in reduction of homelessness. However, these approaches rest on health care and interventions embedded in health care systems. They do not, however, obviate, nor supplant, the centrality of approaches that tackle the social policies and structural factors—including absence of affordable housing and of social safety nets that target vulnerable and low-income individuals—that ultimately set the conditions for homelessness and unstable housing for marginalized populations.

I hope everyone has a terrific week. Until next week.

Warm regards,


Sandro Galea, MD, DrPH
Dean and Professor, Boston University School of Public Health
Twitter: @sandrogalea

Acknowledgement: I am grateful for the contributions of Laura Sampson to this Dean’s Note.

Previous Dean’s Notes are archived at: https://www.bu.edu/sph/tag/deans-note/





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One comment

  1. It is good to see the emphasis this week on homelessness. Another issue intertwined with homelessness is incarceration. Many people leaving incarceration have no place to go once they walk out the door of the prison/jail, and their support structure may be very narrow (if they even have one) having lost or severed many ties with family and friends. Homeless shelters are where quite a few end up going. Programs that provide some support to people toward the end of their sentence and then in the crucial first days and weeks after returning to the community are another approach to stemming some of the homelessness.

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