Question: what are the most common types of abnormal hair loss?
Answer: Androgenetic Alopecia. Androgenetic alopecia is the most common type of hair loss, affecting more than 50 million men and 30 million women in the United States. ... 
Telogen Effluvium. ... 
Anagen Effluvium. ... 
Alopecia Areata. ... 
Tinea Capitis. ... 
Cicatricial Alopecia. ... 
Hair Shaft Abnormalities. ... 
Hypotrichosis.