Itchy scalp at night is considered to be caused by psoriasis, tinea capitis, seborrheic dermatitis and other factors. 1. psoriasis: the cause of the disease is not clear, mostly related to genetic, environmental, immune factors, good in all parts of the body, such as limbs, elbows, scalp, scalp lesions thicker scales, the border is clearer, and there can be itching and other discomforts, which leads to patients with itchy scalp at night. 2. Tinea capitis: is caused by fungal infection, often can cause scalp itching, alopecia, scaly lesions and other manifestations, resulting in patients with itchy scalp at night. 3. seborrheic dermatitis: the etiology is not yet fully understood, mostly with excessive sebum secretion, Malassezia infection, the epidermal barrier function is impaired and other factors related to the sebaceous glands in the distribution of more or sebum secretion of exuberant parts, such as the scalp, chest and back and other parts of the lesions of yellow-red patches, and can be accompanied by itching, resulting in the patient self-conscious itchy scalp at night. There are many other reasons for itchy scalp at night, it is recommended that the patient go to the hospital in time to clarify the cause of the disease, and receive treatment as soon as possible.