Alopecia areata is an autoimmune disease that results in unpredictable hair loss. Your hair growth begins at the follicles, but the immune system attacks them. This condition is not contagious and does not make a person feel sick per say. However, the inflammation can lead permanent damage to some people.
There are numerous autoimmune diseases in which the body mistakenly attacks itself. In this case, white blood cells attack hair follicle cells. As the cells shrink, it slows down the hair production process. Alopecia areata is more severe more some people than others. However, there is no particular reason as to why the immune system damages the hair follicles.
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