Causes of Stomach Pain There are many causes of stomach pain. Your doctor can use an abdominal computed tomography (CT) scan to diagnose the condition. Blood tests often look for signs of a urinary tract infection or a kidney stone, but they rarely identify the exact cause. These tests are sometimes useful for diagnosing pancreatitis. Ultrasounds can be helpful for identifying a gallbladder or gynecologic disorder. You can also undergo an endoscopic evaluation to examine the gastrointestinal tract. Food intolerance Symptoms of food intolerance can last anywhere from severa ...   read more