Because the sites of hemorrhoids and rectal cancer are similar, the clinical diagnosis of rectal cancer and anal canal cancer are often confused when some of their symptoms cross or are atypical. When the veins under the mucous membrane and the anal canal of the lower rectum are congested and blood is depressed for various reasons, the venous pressure is increased or enlarged and varicose due to the weakness of the vein wall, loss of elasticity and reduced resistance to pressure, forming a venous mass called hemorrhoid. Clinical manifestations are anal swelling, foreign body sensation, constipation, hard nodules formed after having bleeding in the anus after stool, and thrombosis formed in external hemorrhoids. Rectal cancer and hemorrhoids are two very different diseases, rectal cancer or anal canal cancer is a malignant tumor. Clinical manifestations: change in bowel habits, anal discomfort, feeling of falling, blood in stool, abnormal shape of stool, abdominal distension, abdominal pain, abdominal tinnitus. When the sacral plexus is invaded in advanced stage, pain around the anus may occur. Because the sites of hemorrhoids and rectal cancer are similar, when some symptoms of rectal cancer and anal canal cancer cross or are atypical, the clinical diagnosis of the two is often confused, and wrong diagnosis is not uncommon, diagnosing anorectal symptoms of disorders as hemorrhoids, which delays the treatment of rectal cancer. Another diagnostic error is that some rectal cancer with anal bleeding symptoms are misdiagnosed as hemorrhoids. Especially when the two coexist, the diagnosis and treatment of hemorrhoids are satisfied after the examination reveals the presence of hemorrhoids, while a full and correct diagnosis cannot be arrived at for a long time. Many diagnostic errors can be prevented if patients with the initial impression of hemorrhoids are carefully questioned about their medical history and carefully examined. 1, Hemorrhoids may occur in people of any age, while patients with rectal cancer are mostly middle-aged or 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, so it 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 alleviated even after medication, you should pay special attention to it. 3, the finger into the anus to check is one of the most effective methods. Because most of the hemorrhoids and rectal cancer occur in the area that can be reached by fingers. If you reach into the anus with your finger and feel some small raised grains inside, you have hemorrhoids. 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.