Anal canal cancer can also be considered a type of rectal cancer, specifically the type located near the anus, referred to as anal canal cancer. Generally, anal canal cancer may have a higher malignancy level, and its initial main symptoms include rectal bleeding and changes in stool characteristics, such as narrower stools. There may also be a sensation of heaviness and pain in the anal area. Diagnosis is typically confirmed through a digital rectal examination and a biopsy. If necessary, an anoscopy and other common examinations can be conducted to check for lesions in other parts of the intestine. Generally, the prognosis for anal canal cancer is not as favorable as for other types of rectal or colon cancer.