From wikipedia

A polyp is an abnormal growth of tissue (tumor) projecting from a mucous membrane. If it is attached to the surface by a narrow elongated stalk it is said to be pedunculated. If no stalk is present it is said to be sessile. Polyps are commonly found in the colon, stomach, nose, sinus(es), urinary bladder and uterus. They may also occur elsewhere in the body where mucous membranes exist like the cervix[1] and small intestine.

From pathlights.com

POLYPS(polyposis): are growths of various sizes, and are especially found in certain portions of the mucous membranes: the nose, large intestine (colon), bladder, and cervix. They are especially common in the rectum and the portion of the colon just above that (the sigmoid).

These growths are benign (that is, not cancerous) and, growing on stalk-like structures, look something like narrow mushrooms. They tend to be hereditary.

SYMPTOMS
In the bladder: Blood in the urine.

BLADDER POLYPS: The medical route is removal of the bladder. Unless they are removed, by natural methods or unnatural, bladder cancer may result.

TREATMENT: A Wisconsin research team discovered that the polyps in most of their patients either lessened or disappeared entirely, when they were placed on a high vitamin C diet. The body is attempting to get rid of various waste products; it needs help doing the job. Vitamin C; more water drinking; nutritious food; a high-fiber diet; and the elimination of processed, fried, and junk foods greatly helps. Take some type of supplemental fiber daily. Be sure to increase your water intake at the same time you increase your fiber intake.