There is a difference between premenstrual chest pains and pregnancy chest pains. Compared with the two, there is a difference in the time of onset, duration and nipple morphology of chest pains. 1. Starting time of chest pain: premenstrual chest pain usually occurs 1 to 2 weeks before the onset of menstruation, while pregnancy chest pain usually occurs 3 to 5 days after the fertilization of the egg. 2. Duration of chest pain: premenstrual chest pain usually disappears on its own after the onset of menstruation when the estrogen level decreases, while pregnancy chest pain usually lasts for the whole pregnancy. 3. nipple shape: chest pain after pregnancy is also often accompanied by breast enlargement, nipple swelling and pain, as well as the emergence of breast Montgomery’s nodes, in preparation for lactation after delivery, but premenstrual chest pain is generally not accompanied by changes in the shape of the nipple. It is recommended that women keep a relaxed mood, regular rest and diet, if the chest pain is unbearable, it is best to go to the hospital in time to do chest ultrasound examination, under the guidance of the doctor to take further measures.