There are many causes of left abdominal pain during pregnancy and a detailed medical history is needed to give a differential diagnosis. The pain in the left side of the abdomen may be caused by the pregnancy itself, or it may be a symptom caused by other acute abdominal conditions that develop at a particular time of pregnancy. If the patient is accompanied by digestive symptoms such as nausea, vomiting, diarrhea, bloating or indigestion. It is suspected that the pain is caused by acute enteritis. If the patient presents with frequent, urgent and painful urination, consider whether the pain is caused by urinary tract infection and stones. If the patient presents with changes in stool properties and habitual changes, and also presents with blood after stool and a feeling of cramping in the abdomen, consider whether the pain is caused by intestinal occupancy. Of course, if there is no ultrasound to clearly identify an intrauterine pregnancy, ultrasound is also needed to exclude ectopic pregnancy.