If you have delayed menstruation for 10 days and have ruled out the possibility of conception, you should consider it to be a pre-menstrual manifestation. The reason is that the blood vessels in the pelvis dilate before the onset of menstruation, which can stimulate pain in the lower abdomen. Even before the onset of menstruation, due to the continuous release of prostaglandins in the body, there will also be pain in the abdomen. At this time, you can first observe a few days, as long as within 4-5 days to come is not a big problem, because the month’s environment, stress, mental factors, and even endocrine hormones, can have delayed menstruation factors occur, once in a while will not affect the health of the body. If more than 3-5 days have not come to menstruation, you need to go to the hospital for ultrasound examination, to rule out the existence of persistent thinning of the lining, if necessary, oral progesterone to promote the growth of the lining, to promote the purpose of menstruation.