There are many causes of vague abdominal pain at 36 weeks, and the diagnosis is complicated, requiring a detailed history and a differential diagnosis. Firstly, pregnancy itself can cause vague abdominal pain. Secondly, there may also be other acute abdominal conditions causing symptoms at a particular time. If the patient presents with urinary symptoms such as urinary urgency, frequency, and painful urination, the focus at this time is to suspect pain caused by urinary tract infection or stones. If the patient has nausea and vomiting, accompanied by digestive system symptoms such as abdominal distension, abdominal pain, diarrhea or dyspepsia, the focus at this time is to suspect pain caused by acute enteritis. If the patient has nausea, vomiting, no exhaustion, defecation, abdominal pain or abdominal distension, the focus of suspicion is on pain caused by acute intestinal obstruction or intussusception. If the patient is a woman, symptoms from gynecological diseases such as cervicitis, pelvic inflammatory disease, ectopic pregnancy, etc. cannot be excluded.