36 weeks pregnant abdomen like menstrual cramps, may be false contractions, the fetus into the pelvis and so on; may also be the first sign of miscarriage, gastrointestinal diseases and so on, should be timely consultation to clarify the cause. 1. Physiological: (1) False contractions may occur when a pregnant woman is 36 weeks pregnant, such as mental tension, anxiety, etc. may lead to false contractions, resulting in vague pain in the abdomen, and has a short duration, long intervals, and irregular characteristics. (2) Usually the fetus will descend around 30 weeks, and the descent of the fetal head may cause pulling pain, and enter the pelvis around 36 weeks, which may produce stimulation and lead to vague pain in the abdomen. 2. Pathologic: (1) If a pregnant woman feels a little vague pain in the abdomen at 36 weeks of pregnancy, accompanied by a feeling of epigastric relaxation, a small amount of vaginal bleeding, abnormal urination and other manifestations, this may be caused by preterm labor. (2) If the pregnant woman does not pay attention to her diet and eats some cold and irritating food, which affects the function of the gastrointestinal tract and leads to gastroenteritis, etc., it may also be accompanied by symptoms such as anorexia, nausea, vomiting, drowsiness, and fatigue. If a pregnant woman has persistent abdominal pain or is accompanied by other discomforts, it is recommended to go to the hospital in time for examination, clarify the cause of the disease and follow the doctor’s instructions to deal with the treatment.