an autoimmune disease can cause symptoms similar to those of an allergy. In contrast to allergies, however, the immune system is directed against the body’s own substances and reacts with dangerous inflammatory reactions.
Keel- Normally, the immune system protect the body from foreign substances and pathogens such as bacteria, viruses, and parasites by initiating a defensive reaction upon contact. In the case of autoimmune disease the immune system recognizes endogenous substances considered foreign and reacts with an exuberant immune response. This leads to inflammatory reactions that can cause severe damage to the tissue. It is estimated that about five to eight percent of all people from one of the almost 100 different autoimmune diseases affected. The symptoms of autoimmune diseases may resemble those of a allergy ähneln. The cause of allergic symptoms, however, is a pathogenic overreaction to harmless exogenous proteins (allergens).