Androgenetic Alopecia

An excess of male hormones (androgens) in the female body cause androgenetic alopecia. Usually found in small amounts, ovarian cysts, certain birth control pills, pregnancy and menopause increase a woman's androgen levels, reports the AHLA.

Telogen Effluvium

Telogen effluvium happens after a traumatic experience---such as childbirth, malnutrition, severe infections, major surgery or extreme stress---causing handfuls of hair to fall out. Fortunately, the hair can grow back, states the Mayo Clinic.

Anagen Effluvium

According to the AHLA, disruption of hair follicles' growth cycle, such as during chemotherapy treatments for cancer, causes anagen effluvium. After chemotherapy, however, the hair typically grows back.

Traction Alopecia

Traction alopecia often affects women who excessively style their hair and/or pull it back tightly, damaging the hair follicles. Avoiding tight hairstyles can reverse hair loss, reports the Mayo Clinic.

Alopecia Areata

Alopecia areata primarily affects women, according to the Mayo Clinic. Possibly an autoimmune disorder---where the body's immune system attacks the hair follicles and large clumps of hair fall out---it can lead to total baldness.

Source:

American Hair Loss Association: Causes of Hair Loss

The Mayo Clinic: Hair Loss

American Hair Loss Association: Women's Hair Loss Overview