Itchy scalp is a symptom of itchy hair and skin caused by a variety of reasons. It can be caused by seborrheic dermatitis, allergies, and other causes. Seborrheic dermatitis is a red papule that appears in areas rich in sebaceous glands and gradually fuses into dark red or yellow-red spots covered with greasy scales or scabs, often occurring on the head, face, chest, back, and armpits. The scalp is characterized by more dandruff, the face is often accompanied by acne, and vesicles resembling eczema can be seen in the axillae and groin of the trunk. The general treatment is regular life, adequate sleep, low-fat diet; external treatment ketoconazole or Zecon shampoo, external application of sulfur preparations and then supplemented with low-effect glucocorticoid cream can be used externally; internal medication can be supplemented with B vitamins to help the treatment, short-term hormone consumption is conducive to rapid control of the disease, the specific program should consult a specialist. Allergy is mainly caused by the body’s contact with a certain allergen that leads to itchy skin, while itchy scalp may also be caused by contact with a certain allergic substance, such as an allergy to a new shampoo or to a certain hair dye, leading to itchy scalp. The main treatment is to avoid contact with the allergen again, anti-allergy medicine anti-allergy treatment and then supplemented by topical anti-itch lotion can be. In short, the main thing is to find the cause of the itchy scalp, and then early standardized treatment according to the physician’s advice.