Sudden chest pain is often considered several factors: first, mastitis, because breastfeeding women need to breastfeed in a timely manner in order to ensure that the milk is discharged smoothly, if you do not breastfeed in a timely manner, or do not use a breast pump to suck out, may lead to excessive accumulation of milk in the mammary glands, which can lead to mastitis, or due to personal cleanliness is not good enough, the bacteria along with the mammary ducts into the mammary glands, inflammation accompanied by a high fever. Secondly, breast nodules and lumps, or breast tumors, need to be examined by molybdenum target to determine whether the boundaries with normal tissues are clear and whether they are benign or malignant. The third aspect is that the pain is caused by menstruation. As estrogen level rises during menstruation, the mammary glands in the breasts also have hyperplasia, which is not a cause for concern, and the pain will naturally be relieved with the end of menstruation.