Because the symptoms of colorectal cancer are insidious and not easily detected by patients, even if the symptoms are detected, patients often think that they are “hemorrhoids” and take them lightly, and there are many such patients in clinical work. I was on night duty that night, and a group of people came into the quiet doctor’s office all of a sudden, including a young man being supported, with a thin face and a painful expression. The child’s words afterwards almost didn’t go away. He said, “Doctor, can you please cure the pain in my bones? I’m going to take my graduate exams in a while.” Facing such a situation, no one can do anything about it, but I just hope everyone can have more awareness and be more alert to colorectal cancer. The most common tests for colorectal cancer are X-ray imaging (barium enema) and colonoscopy. Among them, colonoscopy can not only observe the lesion under direct vision, but also take tissue for pathological examination, so colonoscopy is the most important examination method to diagnose colorectal cancer. Once colorectal cancer is diagnosed, some other tests are needed to clarify the progress of the disease so as to formulate a treatment plan.