A bout of pain in the stomach at 34 weeks of pregnancy may be due to preterm labor, placental abruption and other reasons. 1. Preterm labor with precursor: A bout of pain in the stomach at 34 weeks may be the pain caused by contractions, initially irregular contractions, usually accompanied by a small amount of bloody secretions, and then develop into regular contractions, and finally develop into preterm labor on the verge of delivery. 2. Placenta previa: Due to external stimuli, the normal position of the placenta is detached from the uterine wall before the delivery of the fetus, and pregnant women often feel abdominal pain accompanied by vaginal bleeding. The above symptoms may also be due to the combination of acute appendicitis and other diseases, if the above situation, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, symptomatic treatment.