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Displacement, Natural Hazards, and Health Consequences  

Christelle Cazabat

When natural hazards lead to disasters, they can affect people in many ways, including damaging their housing and negatively impacting their livelihoods. Each year, millions of people are injured or killed as a result of disasters. They can also force people out of their homes: In 2020, 30.7 million new internal displacements linked with disasters, mostly storms or floods, were recorded throughout the world. Between 2010 and 2020, disaster displacements were recorded in 198 countries and territories, making the issue truly global. Such displacement can have severe and long-lasting consequences on physical and mental health, often similar to those of conflict-related displacement. Psychosocial trauma and the deterioration of living standards and housing conditions often alter displaced people’s well-being and their ability to maintain healthy lives or obtain treatment and care. People with disabilities or long-term illnesses are particularly vulnerable in displacement, as are children and older people. Depression and anxiety, malnutrition, communicable diseases, and lack of access to sexual and reproductive health are among the most frequent issues for internally displaced people. The health consequences of displacement linked with disasters vary depending on affected people’s pre-existing conditions and sociodemographic characteristics, the duration and severity of their displacement, and the type of support they are able to access. In cases of mass and protracted displacement, the health of people in communities of refuge and the health systems in the areas of origin and refuge can also be affected, with repercussions on the broader society. Although some of these impacts are relatively frequent and should be systematically considered by national and local governments, humanitarian organizations, and aid providers, each situation requires tailored approaches. Information on the health impacts of displacement remains limited, but the body of knowledge is growing as awareness increases on the scale of current and future displacement crises linked with disasters in a changing climate.