If you exercise regularly and sweat frequently, it is recommended to wash your hair in time after sweating heavily to prevent sweat on your scalp from breeding more bacteria. For people with little hair, dry hair and dry scalp, it is recommended to wash their hair once every 3 to 4 days, because the hair scales will open and water will be lost when washing their hair, and frequent washing may dry their hair. For people with naturally greasy scalp, it is recommended to wash their hair once every two days to keep the scalp fresh.
If the scalp is itchy, it may be a symptom of seborrheic dermatitis when you touch it with your hand. It is recommended to go to the hospital for examination and treatment, otherwise seborrheic dermatitis may cause hair loss.