Severe hair loss in men is commonly caused by seborrheic alopecia and can be treated with medications such as minoxidil. It can also be caused by baldness and other diseases, and can be treated with glucocorticoids and other drugs. 1. Seborrheic Alopecia: Seborrheic alopecia, also known as androgenetic alopecia, is a common cause of severe hair loss in men. It can easily lead to hairline moving back and hair thinning on the top of the head. It can be treated with topical medication such as minoxidil tincture or oral medication such as finasteride tablets. 2. Patch baldness: often manifested as limited hair loss, can be treated with topical halometasone ointment and other glucocorticoid drugs, or topical minoxidil tincture, etc., and local injection of betamethasone and other drugs. Oral glucocorticoid treatment is available when hair loss is severe and progressing rapidly. If the phenomenon of male pattern baldness is serious, go to the hospital in time, the use of the above drugs should pay attention to follow the doctor’s instructions.