The difference between breasts before the onset of menstruation and early pregnancy is the color of the nipple and areola, and if symptoms of early pregnancy appear, you need to consult a doctor in time for examination. Before the onset of menstruation, estrogen changes in the body, progesterone and estrogen will act on the internal ducts of the female breasts and the cells of the glandular follicles, which will lead to a feeling of swelling and fullness of the breasts before the onset of menstruation, but there are no other manifestations. Early pregnancy is also due to estrogen changes, progesterone to promote the development of breast follicles, which leads to breast swelling and pain, in addition, there will be nipple and areola color deepening phenomenon, and there is a certain difference with the symptoms of the menstrual period before the symptoms. If a woman experiences early pregnancy reaction, she should go to the hospital for human chorionic gonadotropin test to find out whether she is pregnant. There is a difference between the breasts before menstruation and early pregnancy, and it is recommended that women go to the hospital when they experience discomfort and follow the doctor’s instructions for examination.