Chest pain is a common clinical symptom with many causes, and the location and severity of chest pain do not necessarily coincide with the location and severity of the lesion. First, adolescent breast pain, usually occurs at the age of 9-13 years, after menarche, the pain will disappear. Second, breast pain during pregnancy, some women in about 40 days of pregnancy, due to the placental villi large secretion of estrogen, progesterone, prolactin, resulting in the mammary glands to increase and produce breast pain, the heavier can last throughout the pregnancy. Third, pre-menstrual breast swelling and pain, there are many girls before the onset of menstruation, breast swelling, hardness, pressure and pain phenomenon, heavy breasts by the slightest vibration or collision will be swelling and pain, after the onset of menstruation of the above changes can disappear. Fourth, if the symptoms are serious or irregular, and there are localized breast lumps and other cases, they are pathological and need to go to the hospital for further examination.