There are more types of hair loss, and the common ones are generally categorized into androgenetic alopecia, patchy baldness, resting alopecia, anagenetic alopecia, and alopecia telangiectasia. 1. Androgenetic alopecia: Androgenetic alopecia is mainly related to heredity and increased secretion of androgen, which is mainly manifested as gradual thinning, reduction and thinning of hair on the top of the forehead. 2. Patchy baldness: Patchy baldness may be related to heredity, stress, autoimmune factors, etc. It is a kind of sudden onset of limited hair loss, with no inflammation or scarring in the hair loss area. 3. Resting hair loss: resting hair loss is a symptom of hair loss due to hair follicles entering the resting phase early after surgery, postpartum, blood loss, shock, and other reasons. 4. Anagen phase alopecia: Anagen phase alopecia, such as chemotherapy, causes patients to experience massive hair loss or even complete hair loss. 5. Pulling alopecia: If patients tie their hair tightly for a long time, the hair will be pulled for a long time, which will lead to hair loss. There are many types and causes of hair loss, so patients are advised to go to the hospital in time to improve the examination and give targeted treatment after clarifying the cause of the disease.