There are many reasons why your breasts do not swell and your nipples hurt. If your nipples hurt during breastfeeding, you should stop breastfeeding on the affected side, wash your nipples with warm water and disinfect them with iodophor to prevent infection, and treat them 2-3 times a day until they heal well before breastfeeding. If there is redness, swelling and pain in the breast, you should pay attention to the possibility of mastitis or breast abscess, and stop breastfeeding, go to the hospital breast surgery, and give anti-infection treatment, and if there is breast abscess, perform surgery. The nipple pain during menstruation is considered to be caused by changes in estrogen and progesterone in the body, and the pain will be relieved naturally after the end of menstruation. If the pain is caused by simple breast hyperplasia, you can consider oral treatment with Xihuang Pill or Xiaojin Tablet, and if it is cystic or tumor, you can consider surgery. If there is a combination of nipple overflow and blood spill, it is necessary to pay attention to the possibility of papillary tumor and breast cancer in the milk duct, so go to the hospital as soon as possible to improve the ultrasound or mammography examination of the breast, and if necessary, surgery.