It is normal for your breasts to swell when you have your period. Before your period, the estrogen in your body will increase and stimulate your breast glands, which can disappear after your period and is best observed. If you have breast swelling and pain after menstruation, consider having breast enlargement or breast cancer, you can go to the hospital for local ultrasound examination. If you have breast enlargement, you can take breast dissipation capsules under the guidance of your doctor. The most important thing is to pay attention to rest and avoid staying up late and mental stress, otherwise it will cause endocrine imbalance, because endocrine imbalance can easily aggravate mastopexy. Regular ultrasound review is recommended to avoid breast cancer. Breast cancer requires surgery and post-operative radiotherapy and chemotherapy treatment.