Not the same. The concept of belly is huge. It includes the stomach, large intestine, small intestine, gall bladder and other things, not just two parts. Stomach pain can also occur in many places. But overall it is slightly to the left above the belly. Pain in the duodenum is in the middle of the abdomen. It will be pain that has no fixed location. Women may also experience lower abdominal pain during their menstrual period.