Itchy head is itchy scalp, itchy scalp may be seborrheic dermatitis, ringworm, psoriasis and other diseases lead to symptoms. Patients need to go to the hospital in time, under the guidance of the doctor for formal treatment. 1. Seborrheic dermatitis: Seborrheic dermatitis is a chronic, recurrent, inflammatory skin disease that occurs on the head, face, chest and back and other seborrheic areas. Patients with seborrheic dermatitis may experience itching in the scalp area, accompanied by excessive oil. 2. Tinea capitis: Tinea capitis is a skin disease caused by fungal infection of the skin. The typical clinical manifestation of this disease is itchy scalp, accompanied by erythema, scaling, hair breakage and so on. 3. Psoriasis: Psoriasis is an immune-mediated, chronic, recurrent, inflammatory, systemic disease induced by both genetic and environmental factors. It occurs on the extensor side of the limbs, scalp, trunk and other parts of the body. Patients with scalp psoriasis may experience scalp itching and increased dandruff. Patients with itchy head should go to the hospital in time, under the guidance of the doctor for targeted treatment.