Autoimmune Disease

An autoimmune disease is an illness that causes the immune system to produce antibodies that attack normal body tissues. Autoimmune is when your body attacks itself. It sees a part of your body or a process as a disease and tries to combat it. This is different from a Primary Immuniodefeciency Disease (PIDD), which occurs when when you do not have the ability to defend against outside diseases.

AAAAI - American Academy of Allergy Asthma & Immunology