The pain in your nipples may be caused by the following conditions: firstly, there may be cracks on the nipples, mostly caused by the baby biting the nipples while breastfeeding; secondly, it may be an inflammation of the breast, mostly caused by bacterial infection and milk stagnation, which can be accompanied by redness, swelling, heat and pain in the breast and tingling sensation in the nipples, which requires timely anti-inflammatory treatment and squeezing out the stagnant milk. If the abscess is caused, it needs to be cut and drained; again, it may be caused by inflammation of the nipple, mostly caused by the invasion of germs after the nipple has a wound, which can be treated by applying erythromycin ointment after breastfeeding and washing the ointment away when you next breastfeed; finally, there may be pain caused by diseases such as breast enlargement, so it is best to go to a hospital breast specialist for a detailed diagnosis and then timely treatment.