Itchy scalp hair loss may be due to often stay up late and other physiological reasons, may also be due to seborrheic dermatitis, ringworm and other pathological reasons. 1. physiological reasons: if the scalp is usually more oil, coupled with frequent fatigue, stay up late or like to eat spicy and stimulating, greasy food, or the use of inappropriate shampoo products, may lead to temporary scalp itching, hair loss, after a period of time to adjust that can be improved. 2. Pathological causes: (1) seborrheic dermatitis: grease secretion is very much, breeding Malassezia, accompanied by scalp erythema, covered with greasy scales, facial greasiness, is likely to be seborrheic dermatitis. (2) ringworm of the head: if the grease is not so much, but accompanied by white scales on the scalp, broken hair, etc. is considered to be a fungal infection caused by ringworm of the head, need to do fungal examination to be clear. Itchy scalp hair loss if long time did not improve, it is recommended to go to the hospital as soon as possible to find out the cause of the interview, and then treatment.