What is the definition or description of: autoimmune disease?

See detailed reply: An autoimmune disease occurs when the body makes an antibody against itself. Normally, antibodies are made to "foreign" or "non-self" proteins. In autoimmune disease, the antibody is directed against your own body. In lupus for example, antibodies are directed against a cell's dna. In thyroid disease, antibodies are directed against the thyroid gland. Blood tests can show if you make these.

Body attacks self: Immune system designed to protect against outside invaders, such as viruses, but, often misdirects and attacks portions of body, such as rheumatoid arthritis (joints), colitis (bowel), or multiple sclerosis(myelin nerve coverings in central nervous system), or cidp (peripheral nervous system). Very complex area, but we are gaining knowledge.

Friendly fire: Our immune system normally protects us from infections. Ironically, that same system sometimes gets confused. In autoimmune diseases the immune system thinks that normal body parts are foreign. The joints are commonly effected, but practically any part of the body can be as well. Common sites of friendly fire include the skin, nerves, kidneys, and lungs.

Autoimmune diseases : In auto immune disease the enemy is from with in . As name implies "auto" is self and "immune " is immune system . One 's own immune system for unknown reason turns against self and destroys or damages tissues or cells . List of auto immune disease are many and growing . End result is destruction of of tissues such as thyroid , pancreas or cells such as white cells , platelets etc.