There are many causes of scalp itching, among which skin diseases are the most common, including inflammatory skin diseases and infectious skin diseases. Common diseases include seborrheic dermatitis of the scalp, atopic dermatitis, psoriasis, and dryness. The degree of itching is related to the type and severity of the disease. Psychogenic disorders such as anxiety, schizophrenia, obsessive-compulsive disorder, and parasitic delusions are also important causes of scalp itching.