Refugee health is the field of study on the health effects experienced by people who have been displaced into another country or even to another part of the world, as a result of unsafe circumstances such as war or persecution. Displaced populations' health is mainly affected by infectious disease, mental health, and chronic diseases that are uncommon in the country in which they eventually settle. Refugee health status is largely due to factors such as the migrant's geographic origin, conditions of refugee camps or urban settings where they lived, and personal, physical, and psychological conditions of the migrant, either pre-existing or acquired while traveling from their homeland to a camp or eventually to their new home.