However, severe stomach pain can also be due to conditions such as colon cancer, appendicitis, diverticulitis, gall bladder disease, or an aortic aneurysm. Additionally, sometimes an upset stomach can ...
Pulmonary etiologies, including lower lobe pneumonias or pulmonary emboli, also may cause abdominal pain. Pleural effusions, empyemas, and pneumothoraces can mimic intra-abdominal conditions.