Breast enlargement, mastitis, excessive pressure can cause breast swelling and pain, women should be alert to breast swelling and pain, considered to be due to the early signs of breast disease. A common cause of breast swelling and pain is breast enlargement, this swelling and pain is often related to the changes in the menstrual cycle, pre-menstrual hormone levels gradually increase, will cause pain in the shallow parts of the breast lumps, especially in the touch, wear clothes, pain aggravation; Second, the pain in the breast area, but also to consider is due to the mastitis caused by lactation or non-lactation may lead to nipple injuries, the bacterial invasion of the mammary ducts can cause Mastitis can cause localized redness, swelling and pain, and breast pain during breastfeeding can be considered to be an inflammation caused by milk stasis and infection; Third, due to excessive work pressure, overtime work, and staying up all night, it can lead to poor immunity, and it can also lead to endocrine disorders, which can cause irregularities in a woman’s menstruation, and the endocrine disorders can lead to disorders in the structure of the breast, which can lead to pain in the breast area.