Itchy scalp hair loss, may be a normal phenomenon, can also be related to seborrheic dermatitis or ringworm and other diseases. 1. Physiological situation: in the local hygiene is poor, such as a long time without washing hair, scalp oil as well as the accumulation of dust, can lead to scalp itching; normal people will also have hair loss every day, but the general number of less. In addition, the use of poor-quality shampoo products can stimulate the scalp, resulting in scalp itching and hair loss. 2. Seborrheic dermatitis: it often occurs in seborrheic areas, and may be related to immune response, individual susceptibility, lipid increase, and Malassezia colonization, etc. When it occurs on the scalp and leads to its damage, it can cause itching as well as dandruff, and the hair becomes thinning or there is shedding. 3. Tinea capitis: the scalp and hair are infected by dermatophytes, can cause the disease, the infection pathway can include direct contact with ringworm patients or asymptomatic carriers, sharing contaminated hats, barber tools, and other indirect infections caused by the scalp scales, thin scabs, can be due to the destruction of the hair follicle and thus cause hair loss. Itchy scalp hair loss, if accompanied by other uncomfortable symptoms, it is recommended that timely medical treatment, under the guidance of the doctor on the cause of symptomatic treatment.