Physiological breast swelling has a variety of reasons, there are normal physiological phenomena, but also may be related to some abnormalities, mostly caused by hormonal changes in the body, the more common are the following six: 1, adolescent breast swelling: adolescent breast swelling is between the ages of 12-18 years old, depending on the person, is generally the development of the secondary sex characteristics, changes in estrogen levels caused by heredity, nutritional levels can be related to. During the period of development, pay attention to a reasonable diet, wear a suitable bra, prevent the pressure and binding of the chest, to ensure the healthy development of the chest; 2, premenstrual breast pain: cyclical, before the onset of menstruation, estrogen levels increase, breast tissue edema can cause swelling and pain. Generally with the passing of menstruation, the symptoms will gradually disappear. You need to pay attention to keep warm during menstruation, do not exercise strenuously; 3, breast swelling and pain after sex: may be related to sexual disharmony, excessive sex. Both parties need to communicate well, improve lifestyle and have a harmonious sex life. 4. Breast swelling and pain during pregnancy: Placental villi secrete a large amount of estrogen, progesterone and prolactin, which can make mammary glands proliferate and increase in size with swelling and pain, and in serious cases, the swelling and pain can last for the whole pregnancy. The breasts are swollen and painful due to poor ducts. Mothers breastfeeding as early as possible, available breast pump to suck out the milk, to keep the breast ducts open; 6, after abortion breast swelling and pain: due to the sudden interruption of pregnancy, the body’s hormone levels drop rapidly, the development of the mammary glands suddenly stop growing, resulting in breast pain, as the body recovers, the symptoms will disappear. Breast pain should pay attention to care, not often press the chest, to wear comfortable, loose underwear, try to choose a better breathable cotton underwear. Do not rub your breasts violently and avoid using chemicals to clean them. Breast pain is not limited to physiological pain, there may also be pathological, to learn breast self-check, there are abnormalities and discomfort in a timely manner to seek medical attention.