Rectal cancer develops relatively fast. If cancer cells from the intestinal wall start to grow, the tumor can occupy half of the intestinal cavity in about one to one and a half years, and if it grows to about two years, the tumor can basically occupy the intestinal cavity for one week, so when the tumor continues to grow, it may lead to symptoms such as narrowing and obstruction of the intestinal cavity. Generally, when the tumor first appears, the patient may have more frequent stools and unformed stools. If the tumor surface is broken and bleeding, the patient may have blood in the stool, and the blood may be mixed with the patient’s stool, or the bleeding may be on the surface of the patient’s stool. Of course, if the tumor is large and causes narrow obstruction of the intestinal cavity, the patient will have abdominal distension, anal stopping exhaustion and defecation, etc. In principle, if rectal cancer is detected early and has to be operated early, the survival rate of the patient is still relatively high.