I. Etiology and pathogenesis Normal adult hair follicles are at least 80% in the anagen phase, so synchronous hair loss will not occur. However, certain causes, such as postpartum, contraceptive pill withdrawal, high fever, malnutrition, gluttony, blood loss, shock, surgery and severe psychological factors, cause more hair follicles to enter the resting phase early, thus causing more hair to fall out synchronously. The hair shed under the microscope is rod-shaped. Second, clinical manifestation The incubation period of this disease is often 2~4 months, and diffuse hair loss is the main manifestation. Patients find that when combing and washing hair, the hair shed on the pillow, clothing increased, lightly pulling the hair easily pull out the hair. 1, acute resting hair loss, postpartum hair loss belongs to the typical acute resting hair loss, generally the more fetal times the more serious the hair loss, certain drugs can also cause. 2, chronic resting alopecia, to 40-60 years old women are common, the course of the disease more than 6 months, can be up to several years, is progressive, the condition is sometimes good and bad. Differential diagnosis: 1. Alopecia areata 2. Alopecia areata 3. Androgenetic alopecia 4. Treatment: Remove the cause, vitamin C, vitamin B complex, Chinese medicine to nourish blood and calm the mind. It can be used to make Shou Wu, Shu Di, Mai Dong, Fu Ling, etc.