Hair loss is usually seen in dermatology or cosmetic surgery. There are many reasons for hair loss, it mainly depends on what causes hair loss. The common causes of hair loss: first, there is poor rest, poor sleep, stress, such cases can cause hair loss; second, someone has a medical disease, such as tumor chemotherapy and other cases can also cause hair loss, there is also baldness or family genetic called seborrheic alopecia, is related to the family genetic hair loss, depending on which case. If there is no tumor, no chemotherapy, no familial heredity, not seborrheic alopecia, just simple hair loss can be seen in dermatology.