The reason for breast stinging while breastfeeding are many and varied, the specific analysis is as follows: 1, improper baby sucking while breastfeeding, such as the baby has horse teeth teeth bite nipple pain, the baby just gripping the top of the nipple, repeated sucking will lead to nipple pain or even rupture, change the way of breastfeeding or remove the horse teeth can be solved. 2, nipple rupture, the new mother’s skin is more tender milk is not enough or nipple is too small, the baby eating milk force. The pain will be unbearable once sucked. 3. lactation pain, when the breast is emptied the mammary gland will produce milk very quickly and the pain will be aggravated by high secretion of lactogen. 4. mastitis, milk stagnation, blockage of milk ducts leading to inflammation of the breast, the breast will be feverish, swollen and painful, which can be treated with cephalosporins.