Bed bugs are nocturnal bugs that feed on human blood. They live in the nooks and crevices of walls and furniture during the day only to come out during the evening hours in search of a human blood meal attracted by body heat and the CO2 respirated out by the sleeping human. Their saliva contains a numbing substance that renders the penetration of the mouth parts painless.
They are not vectors of parasitic diseases or any other disease. However the bites produce allergic reactions at the site of the bite that can range from mild to intense. Heavily infected households can lead to the host developing anemia from chronic blood loss.
Bed bugs are found throughout the world. They are especially prevalent in areas where there is poor hygiene and crowding. Poor and homeless individuals are prone to sleeping in infested areas.