Medicine
The 2010 passage of the Patient Protection and Affordable Care Act could provide new healthcare options for homeless people in the United States, particularly through the optional expansion of Medicaid. A 2013 Yale study indicated that a substantial proportion of the chronically homeless population in America would be able to obtain Medicaid coverage if states expanded Medicaid under the Affordable Care Act.In 1985, the Boston Health Care for the Homeless Program was founded to assist the growing numbers of homeless living on the streets and in shelters in Boston and who were suffering from a lack of effective medical services. In 2004, Boston Health Care for the Homeless in conjunction with the National Health Care for the Homeless Council published a medical manual called The Health Care of Homeless Persons, edited by James J. OConnell, M.D., specifically for the treatment of the homeless population. In June 2008 in Boston, the Jean Yawkey Place, a four-story, 7,214.2-square-metre (77,653 sq ft) building, was opened by the Boston Health Care for the Homeless Program. It is an entire full-service building on the Boston Medical Center campus dedicated to providing healthcare for homeless people.
Homelessness has migrated toward rural and suburban areas. The number of homeless people has not changed dramatically but the number of homeless families has increased according to a report of HUD. The United States Congress appropriated $25 million in the McKinney-Vento Homeless Assistance Grants for 2008 to show the effectiveness of Rapid Re-housing programs in reducing family homelessness. In February 2009, President Obama signed the American Recovery and Reinvestment Act of 2009, part of which addressed homelessness prevention, allocating $1.5 billion for a Homeless Prevention Fund. The Emergency Shelter Grant (ESG) programs name was changed to Emergency Solution Grant (ESG) program, and funds were re-allocated to assist with homeless prevention and rapid re-housing for families and individuals. Causes
Major reasons for homelessness include:

Rent and eviction
Gentrification is a process in which a formerly affordable neighborhood becomes popular with wealthier people, raising housing prices and pushing poorer residents out. Gentrification can cause or influence evictions, foreclosures, and rent regulation. Increased wealth disparity and income inequality causes distortions in the housing market that push rent burdens higher, making housing unaffordable.In many countries, people lose their homes by government orders to make way for newer upscale high-rise buildings, roadways, and other governmental needs. The compensation may be minimal, in which case the former occupants cannot find appropriate new housing and become homeless. Mortgage foreclosures where mortgage holders see the best solution to a loan default is to take and sell the house to pay off the debt can leave people homeless.