Oily head may be caused by genetic factors, bad habits, seborrheic dermatitis and other reasons. 1. Hereditary factors: As the patients with a lot of oil on the head have a family genetic history, they are congenital developed sebaceous glands on the head, which may lead to the appearance of a lot of oil on the head. 2. bad habits: due to often eat greasy, spicy stimulation and high calorie and high fat food, may cause excessive sebaceous gland secretion, which leads to more oil on the head. In addition, long-term stay up late is also easy to make the scalp metabolism is slow, the head of the situation of more oil. 3. Seborrheic dermatitis: Due to the hypersecretion of sebaceous glands in the scalp, the oil secretion is exuberant. It may accumulate in the epidermis of the head, forming a chronic inflammatory disease, so the patient has a lot of oil on the head, sometimes accompanied by symptoms of itching. In addition, the scalp if a moderate amount of oil may be a normal physiological phenomenon, the right amount of oil on the skin to play a protective role. If there is too much oil on the head, you should go to the hospital in time, and follow the doctor’s instructions for treatment.