Sore, red, swollen and painful nipples during breastfeeding need to be treated according to the cause, and common causes include eczema, incorrect breastfeeding posture, and nipple being bitten by the baby. Breastfeeding women due to frequent breastfeeding, the nipple constantly lactation, resulting in the local skin in a long time in the state of moisture, easy to cause eczema, which in turn led to nipple pain, itching. This situation can be relieved by applying warm compresses with warm water on the red, swollen and painful nipples from time to time, or applying some anti-infective ointment such as erythromycin ointment under the guidance of a doctor, but it needs to be wiped clean before breastfeeding. If the breastfeeding posture is incorrect, the baby bites the nipple caused by the nipple redness, swelling and pain, in breastfeeding need to pay attention to let the baby contain the whole areola, try to avoid the baby biting the nipple. In addition, you can also use warm water to clean the nipple. To avoid cracked nipples, you can also squeeze out some milk and smear it on the nipple areola and leave it to dry naturally. If your nipples are red and swollen during breastfeeding, it is recommended that you go to the hospital in time and listen to the advice of a professional doctor.