The difference between early pregnancy breast swelling and premenstrual breast swelling is mainly the difference in the duration of breast swelling and breast changes, there is no difference in the severity of swelling and pain. It will last until about the third month of pregnancy and is accompanied by larger breasts, larger nipples, deeper areola color, larger areolas, etc., caused by increased secretion of progesterone in the body after pregnancy, and if the breast swelling is before menstruation, it is the swelling and pain will disappear after the onset of menstruation, the areola color and areola size will not change, and the breast size will not change. The main difference is that the chest swelling caused by early pregnancy is after menopause, the chest swelling before menstruation without menopause, menstruation will come normally, delayed menstruation with breast swelling consider pregnancy caused by the need for early pregnancy test to confirm the diagnosis.