When a woman has breast swelling and pain but her menstrual period just doesn’t come, it may be a phenomenon caused by breast hyperplasia combined with menstrual disorders, or it may be a physiological manifestation caused by pregnancy. For women with menstrual disorders, most of them are caused by abnormalities in ovarian endocrine function, such as polycystic ovary syndrome and hyperprolactinemia, where the level of hormones secreted by the ovaries is abnormal, and the ovaries can not ovulate normally, so menstruation does not occur regularly, and in severe cases, it will directly lead to amenorrhea. Under the stimulation of hormone abnormality, it may lead to breast gland hyperplasia, which may cause breast swelling and pain or tingling. If a woman does not take contraceptive measures during sexual intercourse, the egg may combine with the sperm to form a fertilized egg and lead to pregnancy. After pregnancy, the lining of the uterus will not peel off and cause menstrual periods to be missed. At the same time, the hormone levels in the body will remain at a high level for a few days, which will also stimulate the development of the mammary glands and ducts, and cause breast swelling and pain.