Dry hair may be caused by physiological factors such as environmental dryness, perming, hair coloring, etc. It may also be caused by anemia, malnutrition, ringworm and other diseases. 1. Physiological factors: if the surrounding environment is dry, perm, hair coloring and other factors, may lead to hair damage, the phenomenon of dry hair. 2. Anemia: Decreased or insufficient production of red blood cells, excessive destruction of red blood cells or blood loss can lead to anemia, resulting in dry hair. 3. Malnutrition: It is due to malnutrition of the body, resulting in insufficient intake of nutrients to the hair follicles, so that the hair lacks moisture and oil moisturizing, resulting in dry and coarse hair. 4. Tinea capitis: it is produced through scalp contact with pathogenic dermatophytes, mainly caused by the genus Microsporum. One of the manifestations of tinea pedis is the gradual development of erythema around the hair follicle into saucer-shaped tinea pedis scabs, with the phenomenon of dry hair, lack of luster, thinning, brittleness, and easy to break. There are many causes of dry hair, it is recommended to go to the hospital, improve the relevant examination to clarify the cause of the disease, under the guidance of the doctor symptomatic treatment.