Scalp itching is mainly caused by a variety of inflammatory skin diseases in the scalp area and is divided into two categories, non-infectious inflammation and infectious inflammation, depending on the etiology. The specific etiology needs to be combined with other symptoms other than itching for accurate determination. For non-infectious inflammatory diseases, seborrheic dermatitis, psoriasis, eczema, dyed hair dermatitis and other diseases can cause itching of the scalp. In addition to itching symptoms, these diseases can be accompanied by obvious new erythema, papules and scales on the scalp in the acute stage, and some of the rashes are accompanied by obvious tendency to exude because of the aggravation of inflammation and stimulation such as scratching, washing and scalding, eventually forming local yellow tissue fluid scabs attached to the scalp. In addition, if there is a history of chemical exposure such as hair dyeing or perming before the onset of the disease, it can lead to intense itching due to contact dermatitis of the scalp, which starts more rapidly than eczema and has a more pronounced tendency to flush, edema and exudate, and can involve the facial area in severe cases. Infectious inflammation includes parasitic infection, bacterial infection, and fungal infection. The parasitic infection caused by head lice is the easiest to identify, and the diagnosis can be made clearly by looking for active scalp bodies and hair-attached lice eggs. In addition, the scalp can be infected by Staphylococcus aureus and Staphylococcus epidermidis resulting in multiple folliculitis, which can manifest itself as itchy red papules on the scalp in the early stages, and as the disease progresses, the inflammatory papules gradually transform into papular pustules with yellowish-white pustules gradually appearing at the top, accompanied by redness and pain. As for fungal infections, overproliferation of Malassezia within the scalp can lead to seborrheic dermatitis of the scalp, and such diseases can further lead to furfuraceous flaking and greasy crust-like damage along with pruritic inflammatory papules. Therefore, due to the various causes of scalp itching, symptomatic treatment based on the removal of the causes is generally recommended after diagnosis by a professional dermatologist.