What is an autoimmune disease ?

Body against itself: In some instances the body responds in an aberrant way and destroys its own cells and tissues. The response may consist of auto-antibodies, as in hemolytic anemia, lupus, or abnormal cells, as in hashimoto; usually both components are involved.

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.