1, adolescent breast pain: usually occurs at the age of 9-13 years, after the first period, the pain will disappear on its own. 2, premenstrual breast pain: there are many women before the onset of menstruation have breast swelling, hardness, pressure pain; heavy breasts by a slight shock or collision will swell pain uncomfortable. This is due to the increase in estrogen levels in the body before menstruation, breast enlargement and edema of the inter-breast tissue. After the onset of menstruation, the above changes can disappear. 3, breast pain during pregnancy: some women in about 40 days of pregnancy, due to the placenta, villi secretion of estrogen, progesterone, prolactin, resulting in the enlargement of the mammary glands, and breast pain, heavy can last throughout pregnancy, without treatment. 4, postpartum breast pain: 3 days – 7 days after childbirth often appear double breast swelling, hard nodes, pain. This is mainly due to lymphatic retention in the breast, venous filling and interstitial edema and breast duct irregularities. 5, breast swelling and pain after abortion: these are due to the sudden interruption of pregnancy, the body’s hormone levels suddenly drop, so that the newly developed breasts suddenly stop growing, resulting in breast blocks and breast pain. 6, breast pain after sex: This is related to the physiological changes in the breast during sex. Sexual indifference or sexual disharmony, because of the failure to achieve sexual satisfaction, breast engorgement, swelling will not easily subside, or subside incomplete, persistent engorgement will make the breast swelling pain. Women do not have to worry about this, but if the pain and swelling does not ease for a long period of time, or even gets worse, or if when you touch your breasts, you find lumps with uneven, unclear edges and poor mobility, you should go to the hospital early for examination and treatment. Many women have the experience of breast pain before menstruation, but often tolerate this affliction not to go to the doctor, because they think it is a minor problem, do not pay attention to it, and as a result, the condition is wrong again and again. If you have breast tenderness too early before your period, or after your period or ovulation, or when you wear underwear or touch it, this phenomenon is pathological and can easily lead to gynecological diseases, such as infertility and breast tumors.