Blood in the stool with no painful symptoms is most commonly seen in internal hemorrhoids, but also in some patients with rectal or anal canal polyps. Because these diseases occur above the dentate line, which is the area of innervation of the internal organs, they are not sensitive to pain, so the patient has no painful symptoms. After repeated episodes of constipation or diarrhea, local vasodilation is induced, leading to bleeding, and the patient may present with blood in the stool. Recurrent attacks may also affect the patient’s life and work, and even induce anemia. In the case of rectal polyps or anal canal polyps, there is also the possibility of malignant transformation. Therefore, the most effective treatment is to remove the lesion surgically, and after the surgery, pay attention to perianal hygiene and reasonable adjustment of diet structure.