It is very common for bowel cancer patients to have unformed stools, mainly because there is a tumor inside the intestine, which causes the patient to have difficulty in forming stools, or causes the patient’s intestinal contents to peristaltically speed up, and the patient appears to have thin stools and unformed stools. In addition, there are also some patients who have broken and bleeding on the surface of intestinal tumor, so the patients may also have more frequent stools and may even have bloody stools or black stools. When patients have unformed stools, such as frequent stools and loose stools, it is recommended to perform colonoscopy as much as possible, because some patients are caused by bowel cancer, and some patients are caused by other lesions inside the intestine, such as intestinal polyps, adenomas or ulcerative colitis, which may result in unformed stools. If it can be diagnosed early as bowel cancer, early surgical treatment can significantly prolong patients’ survival time.