The stomach pain but no bleeding in the third trimester generally belongs to the normal physiological phenomenon of pregnancy, but does not exclude the possibility of acute gastroenteritis, appendicitis, cholecystitis or pre-eclampsia, etc. It is recommended that those whose pain cannot be relieved go to the hospital for timely examination and treatment. 1, physiological phenomenon: the increase in the size of the uterus and hormone secretion during pregnancy may cause discomfort and symptoms of stomach pain in pregnant women. If the pain can be significantly relieved after sufficient rest, there is generally no need to worry excessively; 2. medical and surgical diseases: if the pregnant woman has stomach pain and no bleeding symptoms, if accompanied by nausea, vomiting, diarrhea and other gastrointestinal reactions, the possibility of acute gastroenteritis is suspected. Appendicitis, cholecystitis, pancreatitis, ureteral stones and other medical and surgical diseases may also occur during pregnancy, which in turn will cause symptoms of stomach pain. If a pregnant woman has a medical or surgical disease, it may endanger the life of the mother and the fetus, so she should go to the hospital in time for examination and treatment, and her daily diet should be light, avoiding spicy and stimulating, cold and raw food. 3. Pre-eclampsia miscarriage: when a pregnant woman has stomach pain but no vaginal bleeding, it may also be due to pre-eclampsia miscarriage. If the condition allows, you should go to the hospital in time to check and observe the condition of the fetus. If it is diagnosed as pre-eclampsia miscarriage, you must rest in bed, forbid sex; and stabilize your emotions, and if necessary, use progesterone support treatment under the guidance of your doctor. The first trimester of pregnancy is very important, when the embryo is in an unstable state and prone to pre-eclampsia miscarriage. It is important to pay more attention at this time, not to exercise strenuously, to avoid sexual life as much as possible and to have a nutritious daily diet. When abnormalities occur, treatment should be sought from a regular medical institution.