Question: what are the causes of severe hair loss?
Answer: Androgenetic alopecia. Share on Pinterest Possible causes of hair loss include androgenetic alopecia, pregnancy, and telogen effluvium. ... 
Pregnancy. ... 
Telogen effluvium. ... 
Anagen effluvium. ... 
Alopecia areata. ... 
Traction alopecia. ... 
Medications. ... 
Nutritional deficiencies.