A polyp is an abnormal growth. Polyps can vary in size, shape and location, they may be single or multiple. Some polyps are flat, and some look like a grape with a narrow stalk. We know that when certain types of polyps grow large enough, they can become cancerous. Polyps are usually removed and biopsied to determine if they are cancerous. This happens when a section of the bowel becomes totally or partially blocked, so that stool cannot pass through it. An obstruction can cause the complete absence of stool or gas because no stool can pass through the intestine. It can cause diarrhea since only liquid stool can pass beyond the point of obstruction. Hemorrhoids are swollen and inflamed veins in your anus and lower rectum. Hemorrhoids may result from straining during a bowel movement, or from the increased pressure on these veins. Symptoms sometimes include bleeding during bowel movements, small amounts of bright red blood on your toilet tissue or in the toilet bowl, or itching or irritation in your anal region. These are small tears in the lining of the anal canal. This type of tear may develop from passing hard or large stools during bowel movements. An anal fissure may cause you to experience pain and bleeding. Proctitis is characterized by swelling, redness, and ulcerations of the lining of the rectum. The disease causes the formation of sores on the inner lining of the rectum. Rectal prolapse is a condition in which the rectum becomes stretched out and protrudes out of the anus.