Human blood is a source of energy for female mosquitoes, providing the protein necessary for the development of her eggs. Once the blood is digested, the eggs are laid and the female mosquito will seek another blood meal in order to produce another batch of eggs.

Mosquitoes are attracted by perspiration, warmth, body odor, carbon dioxide, and light. Humans vary in their body chemistry and this is why some people are more prone to being bitten than others.