If a breastfeeding mother has breast tenderness after breastfeeding her baby, it cannot be ruled out that the pain is caused by improper sucking of the baby or by excessive local stimulation of the nipple due to the baby’s newly grown teeth. In severe cases, excessive biting by the baby may also cause damage to the breast, nipple and areola. If the patient also has fever, redness, swelling, heat and pain in the breast, it is mostly due to mastitis and other clinical manifestations. There are also some breast fibroids, breast enlargement, breast nodules, etc., which may have localized stabbing pain when breastfeeding. It is recommended to go to the breast department of the local public hospital for local examination of the breast and ultrasound examination to clarify the diagnosis of the disease.