In the Special Rapporteur on the Right to Adequate Housing (2000), the United Nations Office of the High Commissioner for Human Rights describes the experience of homelessness as "not having stable, safe and adequate housing, nor the means and ability of obtaining it." However, definitions and terminology relating to the concept of housing instability vary by region, time, and discipline.
The United Nations Office of the High Commissioner for Human Rights also emphases that "reducing the matter to putting a roof over one’s head, would fail to take into account the loss of social connection — the feeling of 'belonging nowhere' — and the social exclusion experienced by persons living in homelessness."
In the Healthy People 2020 Social Determinants of Health archive, the Office of Disease Prevention and Health Promotion states that housing instability "encompasses a number of challenges, such as having trouble paying rent, overcrowding, moving frequently, staying with relatives, or spending the bulk of household income on housing."