Sometimes anal cancer causes no symptoms at all. But bleeding is often the first sign of the disease. The bleeding is usually minor. At first, most people assume the bleeding is caused by hemorrhoids painful, swollen veins in the anus and rectum that may bleed. They are a benign and fairly common cause of rectal bleeding. Most often these types of symptoms are more likely to be caused by benign non-cancer conditions, like hemorrhoids, anal fissures, or anal warts.
Hemorrhoids: Symptoms, Causes and Treatment | Live Science
The anus is that part of the intestinal tract that passes through the muscular canal of the pelvis and anal sphincters. It is the final orifice through which stool passes out of the body. In adults, the anus is 4 to 5 centimeters long. The lower half of the anal canal has sensitive nerve endings.
Hemorrhoids are cushions made of blood vessels , connective tissue and muscle located on the anal canal. Functioning hemorrhoids help maintain fecal continence and ensure that no liquid escapes through the sphincter at the end of the digestive tract. Only in a minority of people do hemorrhoids become enlarged or otherwise symptomatic. The exact prevalence of enlarged hemorrhoids is hard to measure because many opt for over-the-counter treatments instead of visiting the doctor. In the United States, about 10 million people — 4.
Rectal bleeding is the presence of bright red blood on the tissue paper, or in the toilet. This may happen after a bowel movement. Gastrointestinal bleeding is bleeding from the upper part of the digestive system.