Barium meal can not detect intestinal cancer. Barium meal is generally used to understand the lesions in upper gastrointestinal tract, such as esophageal, gastric or duodenal lesions, which can be examined by barium meal. Barium meal refers to the patient drinking some barium through the mouth and then observing under X-ray, which can usually understand esophageal cancer lesions or gastric cancer lesions, while duodenal lesions can also be examined with barium meal. If a patient needs to investigate intestinal cancer, it is generally recommended to do colonoscopy directly, but of course, some units can use barium enema for examination, which usually involves filling barium through the anus and then examining under X-ray. If the barium enema suspects that the patient has tumor or occupancy in the intestinal tract, it is also necessary to do colonoscopy to make a clear diagnosis.