Autoimmune Disorders

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Definition

Autoimmune disorders are conditions in which a person's immune system attacks the body's own cells, causing tissue destruction.

Description

Autoimmunity is accepted as the cause of a wide range of disorders, and it is suspected to be responsible for many more. Autoimmune diseases are classified as either general, in which the autoimmune reaction takes place simultaneously in a number of tissues, or organ specific, in which the autoimmune reaction targets a single organ.

Autoimmune disorders include the following:

• Systemic lupus erythematosus. A general autoimmune disease in which antibodies attack a number of different tissues. The disease recurs periodically and is seen mainly in young and middle-aged women.
• Rheumatoid arthritis. Occurs when the immune system attacks and destroys the tissues that line bone joints and cartilage. The disease occurs throughout the body, although some joints may be more affected than others.
• Goodpasture's syndrome. Occurs when antibodies are deposited in the membranes of both the lung and kidneys, causing both inflammation of kidney glomerulus (glomerulonephritis) and lung bleeding. It is typically a disease of young males.
• Grave's disease. Caused by an antibody that binds to specific cells in the thyroid gland, causing them to make excessive amounts of thyroid hormone.
• Hashimoto's thyroiditis. Caused by an antibody that binds to cells in the thyroid gland. Unlike in Grave's disease, however, this antibody's action results in less thyroid hormone being made.
• Pemphigus vulgaris. A group of autoimmune disorders that affect the skin.
• Myasthenia gravis. A condition in which the immune system attacks a receptor on the surface of muscle cells, preventing the muscle from receiving nerve impulses and resulting in severe muscle weakness.
• Scleroderma. Also called CREST syndrome or progressive systemic sclerosis, scleroderma affects the connective tissue.
• Autoimmune hemolytic anemia. Occurs when the body produces antibodies that coat red blood cells.
• Autoimmune thrombocytopenic purpura. Disorder in which the immune system targets and destroys blood platelets.
• Polymyositis and Dermatomyositis. Immune disorders that affect the neuromuscular system.
• Pernicious anemia. Disorder in which the immune system attacks the lining of the stomach in such a way that the body cannot metabolize vitamin B₁₂.
• Sjögren's syndrome. Occurs when the exocrine glands are attacked by the immune system, resulting in excessive dryness.
• Ankylosing spondylitis. Immune system induced degeneration of the joints and soft tissue of the spine.
• Vasculitis. A group of autoimmune disorders in which the immune system attacks and destroys blood vessels.
• Type I diabetes mellitus. May be caused by an antibody that attacks and destroys the islet cells of the pancreas, which produce insulin.
• Amyotrophic lateral schlerosis. Also called Lou Gehrig's disease. An immune disorder that causes the death of neurons which leads to progressive loss of muscular control.
• Guillain-Barre syndrome. Also called infectious polyneuritis. Often occurring after an infection or an immunization (specifically Swine flu), the disease affects the myelin sheath, which coats nerve cells. It causes progressive muscle weakness and paralysis.
• Multiple sclerosis. An autoimmune disorder that may involve a virus affects the central nervous system, causing loss of coordination and muscle control.

— Janie F. Franz

(immunology) An illness involving the formation of autoantibodies which appear to cause pathological damage to the host.

For more information on autoimmune disease, visit Britannica.com.

A disease in which the body produces antibodies that attack its own tissues, leading to the deterioration and in some cases to the destruction of such tissue.