The itchy scalp at night may be caused by pubic lice, seborrheic dermatitis, allergies and other causes. It is recommended that patients go to the hospital, improve the relevant examination, clear the cause after the doctor’s guidance for the cause of treatment. 1, pubic lice disease: mostly caused by infection pubic lice, pubic lice like to parasitize human hair, when it bites the human skin, can be injected into the human skin at the same time toxic secretions, resulting in patients with itchy skin, itching symptoms increased at night, which can make patients appear to itch at night on the body The scalp is also itchy, patients can use topical medications such as topical tincture spray, benzyl benzoate emulsion under the guidance of a doctor; 2, seborrheic dermatitis: mostly caused by Malassezia infection, can lead to inflammatory changes in the skin of the head, chest, back and other parts of the sebaceous glands distribution. Due to inflammatory stimulation, can lead to local erythema, and accompanied by itching symptoms, the symptoms of the night aggravated, which can lead to patients to appear at night on the body itchy scalp also itchy situation, the patient can be under the guidance of the doctor local application of tacrolimus ointment, pimecrolimus cream and other topical drugs for treatment; 3, allergy: when patients sleep at night when inhaled or contact with allergens, it can lead to the body metamorphosis, induced eczema, urticaria. The allergic diseases such as eczema and urticaria can lead to local skin papules and erythema, accompanied by itching symptoms, thus making the patient itchy scalp at night, the patient can take oral loratadine tablets, cetirizine hydrochloride tablets and other antihistamines for treatment under the guidance of a doctor.