There are many types of breast pain, and we broadly classify them into several types: a. Adolescent breast pain: The earliest breast pain in women usually occurs between the ages of 9 and 13, which is a sign that a girl’s breasts are beginning to develop, starting with a slight swelling sensation as the nipples begin to bulge. After the first menstruation, it will gradually disappear with the maturation of breast development during puberty. Second, premenstrual breast swelling and pain: many women have breast swelling and hardness before the onset of menstruation, heavy breasts near the clothing is painful, the original granular or nodular feeling more significant. This is the pre-menstrual body estrogen levels increase, breast hyperplasia, inter-mammary tissue edema triggered. After the onset of menstruation, the above changes disappear. Third, breast swelling and pain during pregnancy: some women in about 40 days after pregnancy, due to the placenta, the villi secrete a lot of estrogen, progesterone, prolactin, so that the mammary gland hyperplasia, breast enlargement, and breast swelling and pain, the heavier the whole pregnancy continued pain, without treatment. Fourth, postpartum breast swelling and pain: 3 to 7 days after childbirth often appear double breast swelling, hard nodes, pain. This is mainly due to lymphatic retention in the breast, venous filling, interstitial edema and poor milk ducts. The prevention and treatment method is to breastfeed the mother as soon as possible. In the case of hard knots, hot compresses can be applied to the breasts before breastfeeding; they can also be used with appropriate draining techniques to promote the smooth flow of the milk ducts. Five, breast pain after abortion: after abortion, some women’s breasts swell and pain, and can be palpable lumps. This is due to the sudden interruption of pregnancy, the body’s hormone levels drop sharply, so that the newly developed mammary glands suddenly stop growing, resulting in breast lumps and breast pain. Six, breast pain after sex: this is related to the physiological changes in the breast during sex. Sexual indifference or sexual life is not in harmony with the sexual satisfaction caused by breast congestion, swelling does not easily subside, or incomplete subside, persistent congestion will cause breast pain. Seven, breast volume is too large: breast volume is too large, and sometimes one of the causes of pain. Breasts are fixed on the front chest by connective tissue. When the breasts are too large or too heavy, especially the inner breasts, pain will be produced as a result of gravity pulling downward for a long time. This can be improved by using an appropriate bra to lift the breasts and reduce the effect of gravity. Sometimes a poorly fitting bra can also cause breast pain, especially in patients with significant pain in the lower rib cage portion of the breast, often caused by the use of a new bra.