The possible causes of breast pain after breastfeeding include: 1. nipple damage, some mothers have incorrect posture and incorrect method in the process of feeding their children, resulting in nipple damage, such as nipple cracking, ulcers, etc. causing nipple and breast pain. 2. blockage of mammary ducts, some mothers have different degrees of blockage of mammary ducts, in the process of breastfeeding, due to the child sucking the breast, so that the milk in the mammary ducts is discharged, but the discharge process is not smooth, which can also cause breast pain. 3. mastitis, mastitis during breastfeeding is the main cause of breast pain. 3. Mastitis, which is the main cause of breast pain during breastfeeding, can also cause breast pain. Lactating mothers will also have obvious symptoms such as breast swelling and pain, hard lumps, redness and swelling of the breast, and fever. In severe cases, there will be generalized fever, loss of appetite and weakness.4. Breast diseases such as breast enlargement and breast fibroids can also cause breast pain after breastfeeding.