Leg pain during breastfeeding is commonly caused by the following reasons: First, muscle strain, breastfeeding patients are overweight, prolonged overweight, will make the leg muscles strain, while the knee, hip and ankle joints are also prone to strain. Patients will show symptoms of leg pain, usually soreness, swelling, rest and massage will gradually relieve the symptoms. Secondly, if the herniated lumbar intervertebral disc occurs during pregnancy and breastfeeding, the accumulation of lesions to a certain extent will induce neural edema, resulting in leg pain. In most cases, it will cause pain on one side of the leg, and the pain symptoms may be more serious, and may even be accompanied by lumbar pain and lumbar spine activity restriction. Third, cold legs, if you do not pay attention to warmth during breastfeeding, leg pain can also occur after the legs are cold.