Breast swelling and pain during menstruation is due to the change of hormone level in the body, and there may be breast swelling and pain. You can do self-massage, for example, massage three circles clockwise and three circles counterclockwise for a total of 15 minutes, 1-2 times a day; at the same time, you can also do local wet and hot compresses, using warm boiling water at 45°C, for local wet compresses, once for 15-20 minutes, once a day, for relief, and generally such swelling and pain may slowly subside after the end of menstruation. However, if this situation still exists at the end of the menstrual period, go to the hospital for a mammogram as soon as possible to determine if there are any chances of breast enlargement. This is because the enlargement of the breast gland and the thickening of blood vessels may lead to breast swelling and pain.