Breast swelling and pain before menstruation is a normal physiological phenomenon, and the estrogen and progesterone in the body before menstruation are at a high level. The development of the mammary ducts and alveoli will increase the size of the breasts and cause the symptoms of breast swelling and pain, which will gradually disappear after the menstruation. There is also a clear relationship with mood swings, if there are obvious mood swings because of certain things, it will also be manifested as premenstrual breast swelling and pain, most of them are also accompanied by irritability and insomnia. If necessary, you can take prozac pills to regulate, or use hot towels to warm compresses can also reduce pain. If the breast swelling pain after menstruation is generally related to breast diseases, such as breast enlargement, breast nodules, or even breast cancer, timely breast ultrasound should be conducted to avoid the presence of breast lesions affecting women’s health. To ensure breast health, you should choose the right underwear, eat less spicy and stimulating food and keep your mood relaxed. Nowadays, the incidence of breast diseases is very high, so it is recommended to have annual breast examination to achieve early detection and early treatment.