Delayed menstruation and stomach pain, for women who used to have regular menstruation, first of all, we should exclude pregnancy, you can take a urine pregnancy test in the morning, or take blood tests to check the blood HCG value, gynecological ultrasound, etc., to further clarify the diagnosis. After excluding the delayed menstruation caused by pregnancy, it is considered to be caused by menstrual disorders, which need to be further combined with gynecological ultrasound to determine the next treatment plan. Progesterone drugs can be applied for treatment, such as dydrogesterone tablets, progesterone soft capsules and so on. For stomach pain, further gynecological examination is needed to clarify the possibility of gynecological inflammation, surgical diseases or urological diseases.