Sore nipples during breastfeeding are mostly caused by incorrect breastfeeding positions and habits. Babies and young children do not hold the whole nipple when sucking milk and the surface of the nipple is cracked, causing pain and discomfort. Simply by adjusting the breastfeeding position, the symptoms can mostly be relieved. When there are obvious cracks on the surface of the nipple, apply erythromycin ointment locally. And wash the nipple before and after breastfeeding to avoid drug residue. Due to cracked nipples, it is easy to cause bacteria to invade and infect the breast tissue and cause acute mastitis. You should try to empty the milk, and if necessary, take oral penicillin or cephalosporin anti-infective treatment under the guidance of a specialist. You should also wash your nipples and wear breastfeeding underwear in your daily life to avoid nipple inversion caused by continuous pressure on the nipple. Take a light diet and avoid spicy and stimulating foods. If there is a fluctuating lump in the breast, you should go to the Breast Surgery Department of the regular hospital in time.