Ultrasound of the gastrointestinal tract is not very useful, because ultrasound can not see the stomach, nor can it see the intestines. Need to perform a digestive endoscopy to understand the gastrointestinal tract lesions, such as electronic gastroscopy, electronic colonoscopy is the most accurate method of examination. Ultrasound is mainly to understand the liver, gallbladder, pancreas and spleen, as well as both kidneys, ureter, bladder, prostate and uterine adnexa, so that you can indirectly understand whether abdominal pain is caused by gastrointestinal diseases. If you want to know about gastrointestinal diseases, you need to complete a gastrointestinal endoscopy. Gastroscopy can be done on an empty stomach, which is required for more than eight hours and is best done in the morning on an empty stomach. Enteroscopy need to perform intestinal preparation, before you can make an appointment to do enteroscopy, the specific need to go to the regular hospital to consult the gastroenterologist.