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Auto immune disorder Introduction The immune system is a collection of special cells and chemicals that fight infection-causing agents such as bacteria and viruses. An autoimmune disorder occurs when a person's immune system mistakenly attacks their own body tissues. Autoimmune disorders are broadly grouped into two categories –  'organ-specific'  means one organ is affected, while in  'non-organ-specific'  disorders, multiple organs or body systems may be affected. There are  around 80 different autoimmune  disorders ranging in severity from mild to disabling, depending on which system of the body is under attack and to what degree. For unknown reasons, women are more susceptible than men, particularly during their childbearing years. It is thought that sex hormones may be at least partly responsible. There is generally no cure, but the symptoms of autoimmune disorders can be managed. Risk factors for autoimmune disorders The exact causes