Irregular, vague pain in the chest is considered to be the cause of cystic hyperplasia of the breast. The mammary glands are affected by the hormone levels in the body and undergo regular proliferation and remodeling. When the hormone levels are out of balance, the mammary glands will over-expand and under-regenerate, manifesting as breast pain and discomfort. This kind of pain mostly appears in the days before menstruation, after menstruation the pain is obviously relieved, color ultrasound examination can find irregular breast hyperplasia. Severe pain can be treated with oral lactofetish elimination, and ultrasound can be used for follow-up observation. In addition, acute mastitis will also appear breast pain. If the inflammation occurs in more than one area there will be irregular pain, need to take oral antibiotic drugs for symptomatic treatment. Pain and discomfort caused by trauma such as squeezing of the mammary glands, as well as pain caused by strain or pulling of the muscles around the mammary glands cannot be ruled out, so try to go to the hospital and check the specific situation.