Hair dryness is usually not directly related to heavy humidity, and needs to be considered due to chemical damage, malnutrition, environmental factors. 1. Chemical damage: frequent perming and dyeing of hair, the use of hairdryers, etc., will easily cause some damage to the hair, thus leading to dry hair. 2. Poor nutrition: insufficient nutritional intake will cause the scalp hair follicles can not get nutrients to moisturize, so it will lead to dry hair, and even the phenomenon of hair loss. 3. Environmental factors: dry hair may have a certain relationship with environmental factors, especially the environment is dry, may easily lead to dry hair, dry, no luster. Dry hair usually has nothing to do with heavy moisture, we recommend that patients go to the hospital in time to improve the examination, after a clear diagnosis to give standardized treatment, do not ignore the symptoms, take it lightly.