If your scalp itches after washing your hair, you need to consider first ruling out some diseases that cause itchy scalp, such as folliculitis, seborrhea or eczema of the scalp. If it is simply an itchy scalp, you must consider whether it is because the time spent washing your hair is too long or the number of times you wash your hair is too frequent, which may damage the sebaceous film on the surface of the scalp and make it dry. And rinsing with too much hot water when bathing may also damage the cuticle of the skin, or even destroy the cuticle of the skin due to excessive rubbing, resulting in the stimulation of certain nerves under the dermis of the skin, which may aggravate the occurrence of itchy skin.