Hair loss during breastfeeding is known as postpartum hair loss. Severe postpartum hair loss may be caused by factors such as hormone level changes, malnutrition and mental stress. 1. Hormone level changes: the life span of hair is related to the level of estrogen. After a woman gives birth, the level of estrogen decreases, and the hair that exceeds the normal metabolic cycle will naturally fall out, i.e., the phenomenon of severe postpartum hair loss occurs. 2. Malnutrition: Postpartum women are physically weak and prone to insufficient absorption of nutrients, which leads to hair loss and even severe postpartum alopecia. 3. Mental stress: women are under a lot of mental stress after giving birth, and are often prone to anxiety or depression, resulting in metabolic disorders, which can cause severe postpartum hair loss. If postpartum hair loss occurs, it is recommended to go to the hospital and consult the doctor in detail.