Women generally do not have menstruation on the day of menstruation, but have abdominal pain: 1, there may be a delayed menstruation, may be affected by irregular life or work pressure, emotional instability and lead to the 2, when women are pregnant, will not have menstruation, if there is a pre-eclampsia, will be accompanied by abdominal pain. 3, women in the affected by the cold or eat unclean food, will also lead to pain. 4. When women suffer from gynecological diseases such as ovarian cysts or appendicitis, abdominal pain will also occur. So when a woman does not have a period and has abdominal pain, first rule out pregnancy, then do an ultrasound to check, according to the different causes of symptomatic treatment.