The pain of breast enlargement usually lasts for about two to five days, but the exact duration varies from person to person. The pain of breast enlargement mainly occurs during and before menstruation, and the duration of the pain will be different for each person due to his/her different physical condition, which needs to be decided according to the severity of the breast enlargement. Breast enlargement is a highly prevalent disease in women, mainly due to the imbalance of the ratio of estrogen to progesterone in the body. Due to hormonal instability in the body, it may be caused by unstable hormone levels in the body during pregnancy and breastfeeding. It is also related to emotions. If you are often in a stressful environment or emotionally unstable, etc., it may cause endocrine imbalance and induce mammary gland hyperplasia. Breast enlargement appears cyclic pain, during menstruation due to the increase of estrogen in the body, may induce breast enlargement, the pain lasts for two to three days and then disappears. Some women may show persistent pain during menstruation, which may increase to about five days. If the pain persists, you need to go to the hospital in time for treatment under the guidance of your doctor.