Gastroenteroscopy and abdominal CT can be distinguished from each other in terms of the principle of the instrument, the method of examination and the diagnosis of the disease. 1. Principle of the instrument: Gastroenteroscopy is to observe the internal condition of esophagus, stomach, colon and large intestine through the stomach or anus by using the fiber hose equipped with electronic sensors and light source; Abdominal intensified CT is to diagnose the abdominal cavity organs according to the different enhancement characteristics of various diseased tissues, especially occupying lesions; 2. Examination mode: gastroenteroscopy belongs to endoscopy, which is a relatively painful invasive operation, requiring the gastroscope to enter the stomach through the esophagus, and enteroscopy needs to enter through the anus, and enteroscopy needs to be emptied before the intestines; abdominal CT belongs to the imaging examination, which is a kind of painless and non-invasive operation, but CT also has side effects such as human body injuries caused by radiation and contrast agents; 3. Diagnosis of disease perspective: because gastroenteroscopy is an invasive operation, it can find out whether there are lesions in the mucosa of the gastrointestinal tract and the specific lesions. The resolution of gastroenteroscopy is increasing, through the magnification of the examination, can even check out the gastrointestinal tract 1 ~ 2 mm of tiny lesions, but also under the intuition of clamping the lesion tissue sent to the pathology biopsy, or the line of gastroenteroscopy of the therapeutic surgery. Abdominal CT is an indirect examination, which can indirectly help to observe whether there are infectious diseases, benign or malignant tumors, and whether there are metastatic tumors in the abdominal organs. You need to consult a specialized doctor for the specific examination and choose the appropriate one to avoid delaying your condition.