This is so embarassing, but I've been having hard stools which can be very painful to pass. Sometimes there is also blood. (But the blood is only present if the stool is extremely painful) Could this be due to not getting enough fiber and/or excersize? When I used to walk 2 miles a day I seemed to have softer stools. Now that I've stopped walking my stools seem to be very hard. I'm so scared that this could be a symptom of colon cancer!