
Alopecia is the medical description of the loss of hair from the head or body, sometimes to the extent of baldness. Although alopecia can be due to aesthetic depilation of body hair, it tends to be involuntary and unwelcome, or androgenic alopecia. Alopecia can also be caused by the psychological compulsion to pull out one’s own hair (trichotillomania). It can also be the consequence of voluntary hairstyling routines such as ponytails or braids, or due to hair relaxer solutions, and hot hair irons. In some cases, alopecia is due to underlying medical conditions, such as iron deficiency.
Hair loss can occur in only one section, which is known as alopecia areata. This is the most common form of this disease and is consistent with sudden hair loss, causing patches to appear on the scalp or other areas of the body. If left untreated, or if the disease does not respond to treatment, complete baldness can result in the affected area, or alopecia totalis. When the entire body suffers from complete hair loss, it is alopecia universalis. It is similar to effects that occur with chemotherapy. source