The examination methods that can be chosen for abdominal diseases include ultrasound, CT, endoscopy, MRI, etc. The examination methods chosen for different diseases are different, and there is no such thing as the clearest examination. Ultrasound is one of the most commonly used examination methods for abdominal diseases, which has the advantages of rapid examination, lower price, no radiation, etc. It can be used for preliminary examination of liver cancer, cholelithiasis, acute cholecystitis, acute and chronic pyelonephritis, and urinary stones, etc. CT examination is more time-consuming and relatively expensive. CT examination is longer, more expensive and produces electromagnetic radiation. For the problems found in the initial screening of ultrasound can be further CT examination to clarify the diagnosis, for acute pancreatitis, pancreatic cancer, hepatocellular carcinoma and other organic diseases detection effect is good. Enhanced CT can also be performed for some diseases. CT can deduce the disease through the morphological changes of the wall of the digestive tract, such as dilatation and edema of the intestines, thickening of the stomach wall, deformation of the intestinal wall, etc., but it is difficult to observe the whole picture of the digestive tract. Endoscopy is the best examination method for abdominal gastrointestinal cavity diseases, which can not only observe the lesions directly, but also take biopsies for pathologic examination to further clarify the diagnosis, which is the best means to examine the gastrointestinal cavity diseases. MRI has relatively few applications in abdominal diseases, but has an important role in the diagnosis of biliary and vascular diseases. MRI can also be performed for other organic diseases. Patients in need of abdominal examinations are advised to visit a hospital as soon as possible and consult a medical professional to determine the most appropriate test for their condition.