Cockroaches are insects that live in many locations around the world. These pests adapt easily to a variety of environments. They prefer warm conditions found most often in buildings. They are mainly active at night and will run away from light. A cockroach allergy is a common trigger of year-round allergy and asthma. If you are allergic to them, they can trigger asthma attacks. Studies show children who are allergic to cockroaches, and are exposed to them, need to go to the hospital for asthma more often than other children with asthma.

Cockroaches contain a protein that is an allergen for many people. An allergen is a substance that causes an allergic immune reaction. The body parts, saliva and waste of cockroaches are allergens. Even dead cockroaches can cause allergic reactions.