Severe hair loss during breastfeeding may be caused by changes in sex hormone levels, fatigue and anxiety, and inadequate nutritional intake. 1. Changes in the level of sex hormones in the body: This is the root cause, after delivery, the level of estrogen and progesterone in the body, from the high level in pregnancy to the postnatal period to reduce. Decreasing hormone levels can cause hair follicle dysfunction, inhibiting hair production and leading to increased hair loss. Generally within one year after delivery, hair follicle cells can gradually restore normal function. 2. Tiredness and anxiety: Lactation is tiring, lack of sleep or anxiety is obvious, which affects hair growth and leads to an increase in hair loss. 3. Inadequate nutritional intake: Inadequate nutritional intake such as vitamins and trace elements during lactation can also lead to severe hair loss. Hair loss during breastfeeding is mostly a physiological phenomenon and generally does not require special treatment. If hair loss is serious, you can take B vitamins to regulate. Normally, you should keep your mood happy, avoid mental tension, take a walk, don’t stuff yourself. You can eat more fresh vegetables, fruits, beans, eggs and so on. During the breastfeeding period, you can properly supplement calcium, iron, zinc, selenium and other trace elements. If you have any uncomfortable symptoms, you need to go to the hospital as soon as possible, by the doctor according to the specific conditions, to formulate individualized diagnosis and treatment plan, so as not to delay the condition.