Hair loss facts Hair loss is a very common condition and affects most people at some time in their lives. Androgenetic hair loss is seen in both men and women but is worse in men. Health issues like thyroid disease, anemia, and low vitamin levels may cause hair loss. Alopecia areata is a very common, coin-shaped temporary hair loss patch that usually resolves on its own. Medications for hair regrowth include minoxidil (Rogaine), finasteride (Propecia), and dutasteride (Avodart). Prevention includes good hair hygiene, regular shampooing, and good nutrition.