What are the symptoms of colon polyps?

Most small polyps don't cause symptoms. Often, people don't know they have one until the doctor finds it during a regular checkup or while testing them for something else.

But some people do have symptoms like these:

• bleeding from the anus. You might notice blood on your underwear or on toilet paper after you've had a bowel movement.
  
  
• constipation or diarrhea that lasts more than a week.
  
  
• blood in the stool. Blood can make stool look black, or it can show up as red streaks in the stool.
  
  

If you have any of these symptoms, see a doctor to find out what the problem is.

source: http://digestive.niddk.nih.gov/ddiseases/pubs/colonpolyps_ez/index.htm