Alopecia Areata causes in black women is the same as any other ethnicity. Alopecia is the medical term for baldness and the type (Areata) is an auto immune disease that causes hair to fall out. It cannot be cured but can be treated with drugs like Rogaine.
Often African American women experience the loss of their thirsty roots but it has nothing to do with Alopecia Areata. Many times the symptoms are short term and due to stress, disease, pregnancy, medication or hair breakage from damaged hair.
Other types of hair loss in women