Because the sites of hemorrhoids and rectal cancer are similar, the diagnosis of the two is often confused, and it is easy to diagnose anorectal symptom disorders as hemorrhoids, which delays the treatment of rectal cancer. If patients with the initial impression of hemorrhoids are carefully questioned about their medical history and examined carefully, many diagnostic errors can be prevented. 1, Hemorrhoids may occur in people of any age, while patients with rectal cancer are mostly middle-aged and elderly. 2. Patients with hemorrhoids have blood in their stool, which is due to scraping the affected area during defecation. Most of the blood drips down with the discharge of stool and does not mix with feces, much less the presence of mucus. In contrast, the stool of rectal cancer patients is often mixed with blood, mucus and thick liquid, and the stool habit will change significantly. The frequency of stools increases, and there is also a feeling of urgency and heaviness. If the diarrhea cannot be reduced even after medication, you should pay special attention to it. The most effective method is anal diagnosis. Because most of the hemorrhoids and rectal cancer occur in the area that can be reached by fingers. If you feel some raised grains inside the anus with your finger, then it is hemorrhoid. If you feel a cauliflower lump in the intestine or an ulcer with a raised edge and a sunken center, and find that the intestinal cavity is so narrow that only a finger can fit; after examination, blood, thick fluid and mucus are on the finger sleeve, you are most likely to have rectal cancer and should go to the hospital as soon as possible to avoid missing the opportunity for treatment.