Many physiological women will have this experience, menstruation is delayed but there is abdominal pain, so stomach pain but no period is what is going on? There are several reasons for this situation: 1, endocrine factors: hormone secretion disorder in the body can cause abdominal pain and delayed menstruation. With the endometrial release of prostaglandins and luteal phase progesterone elevation have a certain relationship. 2, mental, neurological factors: abnormal emotions, excessive joy, sadness, fear, worry and stress can stimulate the pelvic pain fibers through the central nervous system, abdominal pain, accompanied by breast distension, distraction and abdominal cramps, and delayed menstruation. The symptoms vary in severity. 3, pregnancy: many women in the early stages of pregnancy will have symptoms of abdominal pain, such as delayed menstruation, the first thing to consider is whether the delayed period is caused by pregnancy. 4, PMS: PMS patients will have such conditions, which may be related to ovarian hormone ratio imbalance, central neurotransmitter abnormalities will appear abdominal pain and delayed menstruation, and even emotional and mental abnormalities. 5, other organic causes: such as cervical adhesions caused by uterine surgery and abortion surgery, and other abdominal organ lesions need to be checked by a doctor to confirm the diagnosis. The above are the common causes of abdominal pain and delayed menstruation, but of course there are many factors that can cause this symptom, which need to be examined in detail.