Bowel cancer does not have obvious specific symptoms, and the diagnosis has to be confirmed by systematic tests; the three-minute self-test for bowel cancer usually turns out to be inaccurate. Bowel cancer usually has no obvious symptoms in the early stage. As the tumor grows and develops, diarrhea, bloating, indigestion, constipation and diarrhea alternately may occur. When the patient’s symptoms are severe, he or she may experience blood in the stool, abdominal pain, and fatigue. Digestive disorders such as ulcerative colitis can cause similar symptoms, so it is not possible to identify bowel cancer with the three-minute self-test. When bowel cancer is suspected, patients should undergo relevant systematic examinations, such as abdominal CT, X-ray and other imaging tests, and also need to undergo colonoscopy and take biopsy to confirm the diagnosis through pathological testing. Bowel cancer does not have specific symptoms, so patients should consult doctors in time when gastrointestinal discomfort occurs, and should not blindly test themselves for bowel cancer, so as not to delay the aggravation of the condition.