Colorectal cancer is a common malignant tumor of the gastrointestinal tract. The causes of the disease are complex, so there is no definite control method at one time. It has a high clinical mortality rate, second only to stomach cancer and esophageal cancer. Since the symptoms in the early stage of colorectal cancer are not obvious, it is usually found in the late stage, but the coming of colorectal cancer will give some warnings! I. Family history of colorectal cancer: II. Unexplained change of stool habit: III. Family history of colorectal polyps: IV. Unexplained loss of appetite in middle-aged and elderly people V. Patients with colorectal cancer: VI. Abdominal pain: VII. Previous gastrointestinal tumors (such as stomach cancer), breast cancer, etc.: VIII. Progressive anemia: IX. Change of temperament: X. Blood in stool