Itchy scalp after washing hair consider: a. Allergy to shampoo causes itching, rinse several times with warm water to flush out the shampoo residue on the hair, take oral paracetamol treatment, and try to avoid scratching to prevent damage to the scalp and cause inflammation. The use of poor quality shampoo can also lead to itchy scalp after washing your hair. Second, itself is dry hair, the use of alkaline shampoo cream, will stimulate the scalp, so that the scalp becomes more dry, itchy symptoms. It is best to use shampoos that contain nourishing ingredients such as amino acids inside, and use a highly moisturizing conditioner after the hair is cleaned. The conditioner contains nourishing substances that can replenish the moisture and nutrients needed by the hair and form a protective film on the scalp. Usually massage your scalp with your fingers to promote blood circulation in your head and eat more fresh fruits and vegetables. Washing your hair not too often, 1-2 times a week, can improve the situation.