Housing insecurity in America comes in many forms. As defined by the U.S. Department of Health and Human Services, housing insecurity includes high housing costs in proportion to income, poor housing quality, unstable neighborhoods, overcrowding, or homelessness. While the number of people affected by all forms of housing insecurity is not entirely clear, there are an estimated 1.5 million people in the nation who are homeless each year, while an estimated 41 million U.S. households paid more than 30% of their pretax income for housing. In all its forms, housing insecurity takes a toll on the health of people, whether they have no home, lack a stable living environment, or pay a larger than recommended share of their income on housing, crowding out the ability to pay for other necessities.