Coarse and hard hair may be caused by congenital factors, external factors such as sun exposure, the use of drugs may also cause hair to become thick and hard. 1. The texture of hair is mainly related to genetic factors, some people’s hair will appear more coarse and hard, rough and other phenomena, generally do not need special treatment. Normally, you can use conditioner and other relief, avoid the use of irritating shampoo products. 2. In addition, some external factors such as sun exposure can make the hair damage, can be strengthened by sunscreen and other recovery. The use of certain drugs such as hormone drugs, may affect the growth of hair, generally stop using drugs can return to normal. If hair abnormalities are obvious, it is recommended to go to the hospital in a timely manner to clarify the cause and follow the doctor’s instructions for treatment.