Breast pain and itching during breastfeeding can be caused by milk accumulation, acute mastitis, mental factors and so on. 1. Milk buildup: factors such as excessive maternal supplementation can lead to more lactation, and after meeting the infant’s feeding needs, too much milk can accumulate in the breasts, which can lead to breast swelling and itching, and localized lumps can also be touched. 2. Acute mastitis: When breastfeeding babies eat breast milk and suck on the nipple, they often bite the nipple, and after the nipple is damaged, it is easy for bacteria and other pathogens to enter the mammary ducts, which leads to infections, and the breasts can be inflamed and swollen, hot and painful, and also accompanied by itching and discomfort. 3. Mental factors: changes in hormone levels during breastfeeding, taking care of the baby too much fatigue, living in the family environment and other factors, can lead to greater emotional fluctuations in the mother, may also trigger discomfort in the breast and other parts of the body, localized swelling and pain and itching symptoms. When breasts swell and itch during breastfeeding, you should consult a doctor in time, and under the guidance of a specialized doctor, you can actively carry out appropriate treatment to help alleviate the discomfort symptoms as soon as possible.