The proportion of young rectal cancer patients is high, and young patients less than 30 years old account for about 10% to 15% of all patients. Patients with rectal cancer younger than 30 years old are easy to be missed. Young patients are seen for blood in the stool, which may be misdiagnosed as hemorrhoids by inexperienced doctors. Most patients, including young people, are diagnosed with rectal cancer because of blood in the stool. 80% of rectal cancer patients will have blood in the stool, but in fact, rectal cancer is often combined with some other manifestations. For example, rectal irritation symptoms: frequent bowel movements, change of bowel habits, feeling of falling in the anus before defecation, urgency and heaviness, feeling of incomplete defecation, etc. Intestinal stenosis symptoms: cancer invasion causes intestinal stenosis. Initially, the stool becomes deformed and thin, and when partial obstruction of the intestinal canal is caused, there are manifestations such as abdominal pain, abdominal distension and incomplete intestinal obstruction with hyperactive bowel sounds. Infection of cancer tumor: blood and mucus on the surface of stool, or even pus and blood stool.