Itchy head can be caused by not paying attention to hygiene, contact dermatitis, ringworm and other reasons. 1. Do not pay attention to hygiene: If you do not pay attention to head hygiene, long-term not wash your hair, resulting in hair containing a large amount of grease and dandruff, bacterial growth triggered by the itchy head. 2. Contact dermatitis: if the usual life in contact with allergens or irritants, such as shampoo, conditioner, as well as perm, hair coloring and other stimulation of the scalp, may cause itchy head, and may be accompanied by pimples or localized erythema and so on. 3. Tinea capitis: a kind of disease caused by fungal infection in the scalp area, patients will have itchy symptoms on the head, accompanied by dandruff, hair loss and other phenomena. In daily life should pay attention to head hygiene, wash your hair diligently. In addition, itchy head may also be seborrheic dermatitis, folliculitis, scalp psoriasis and other causes, the patient in the exclusion of non-physiological causes, should go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor to give the relevant treatment.