Signs and symptoms
The medical term for hair loss is alopecia. Pattern baldness (androgenetic alopecia), the most common type of alopecia, affects roughly one-third of men and women. It's typically permanent. Another type of alopecia, alopecia areata, can be temporary. It can involve hair loss on your scalp or other parts of your body.
Having androgenetic alopecia may mean you experience hair loss as early as during your teen years. For men, this type of baldness is typically characterized by hair loss that begins at the temples and crown. The end result may be partial or complete baldness. Women with androgenetic alopecia usually have hair loss limited to thinning at the front, sides or crown. Complete baldness rarely occurs in women.
With alopecia areata, baldness usually occurs in small, round, smooth patches. You may lose only scalp hair, or you may lose body hair as well.