Severe hair loss after childbirth may be caused by physiological factors such as hormonal changes in the body and mental stress, or it may be caused by seborrheic alopecia, ringworm, and other reasons such as folliculitis. 1. Physiological factors: the level of estrogen in a woman’s body will decrease rapidly after delivery, and the living environment of a woman will change a lot after delivery, and she will experience mental stress or anxiety and depression. All these will lead to serious hair loss after delivery, which is a normal physiological phenomenon. 2. Seborrheic alopecia: the etiology of seborrheic dermatitis has not been clearly defined, and it is considered to be related to factors such as a decrease in the concentration of sex hormone binding protein or a high concentration of free circulating testosterone. Patients will show a decrease in hair loss, hair thinning and shedding, if women in the postpartum seborrheic alopecia will have serious symptoms of hair loss. 3. Tinea capitis: Tinea capitis is mainly caused by infection of Trichophyton and Epidermophyton. Patients will have hair loss with scaling, hair breakage and other symptoms, so patients with postpartum tinea capitis will have severe hair loss. 4. Other: severe hair loss after childbirth may also be caused by folliculitis, baldness, malnutrition and other diseases. It is recommended that those who suffer from severe hair loss after giving birth need to consult a doctor in time and choose the appropriate measures for treatment under the guidance of the doctor.