Chest swelling and pain for 2 days and then no pain, may be related to physiological factors, may also be due to breast hyperplasia, heart disease and other reasons. 1. Physiological factors: common in the ovulation period before menstruation, some women are affected by changes in the level of estrogen in the body, there may be chest pain symptoms, but may last only 2 days and no pain. There are also some women who suffer from breast swelling and pain for a longer period of time, which may last from the period after ovulation to the period before menstruation, about half a month or so. 2. Breast hyperplasia: Some women with breast hyperplasia may experience occasional breast swelling and pain for two days and then no pain, which often occurs before the menstrual cycle, or during menstruation. 3. heart disease: common in angina pectoris, coronary heart disease and other diseases, these patients in the body of excessive fatigue or emotional overstimulation and other circumstances, often will appear chest swelling and pain for two days and no pain, may also be accompanied by back pain. Chest swelling pain for 2 days and no pain, may also be caused by other reasons, it is recommended to consult a doctor as soon as possible, clear causes, give targeted treatment and conditioning.