Oily hair is not necessarily seborrheic alopecia, and should be judged according to the specific condition. Healthy people hair oil is actually a normal phenomenon, the scalp area of the sebaceous glands will secrete oil, these oils can not only moisturize the scalp and hair, but also in the scalp and the air between the formation of a protective film, to protect the scalp from airborne bacteria or radiation caused by the damage, so the hair is appropriate oil on the scalp is good. If the patient’s hair oil situation is serious and accompanied by flaking, hair loss and other symptoms, it may be a symptom of seborrheic alopecia, which is due to hormone secretion disorders or their own bad habits; if the performance of erythema, greasy scales with itching, it may be due to seborrheic dermatitis. Therefore, there is no direct causal relationship between hair oil and seborrheic alopecia, patients with hair oil symptoms are serious, or the symptoms continue for several days without improvement, should go to the hospital in time for treatment.