Hair Loss Causes

Anagen effluvium - Permanent hair loss caused by damage to hair follicles
Telogen effluvium - hair loss as a result of temporary damage to follicles
Anagen effluvium is generally due to internally administered medications, such as chemotherapy agents, that poison the growing hair follicle. Telogen effluvium is due to the increased number of hair follicles entering the resting stage. The most common causes of telogen effluvium are:
Physical stress - surgery, illness, anemia, rapid weight change
Emotional stress - Mental illness, death in the family
thyroid disorders
Medications - High doses of vitamin A (sometimes present in dietary supplements), blood pressure medications, gout medication
Hormonal Changes - Pregnancy, birth control pills, menopause
Androgenetic Alopecia - Male / Female Pattern Baldness
Up to 95 percent of permanent hair loss due to androgenetic alopecia, a hereditary condition that affects millions of men, women and children