Hi susan,Yes, in people with ibs-c the stool is effectively pushed one direction and then the other. This usually occurs in the large intestine. The feeling of incomplete evacuation is because the peristalsis in the colon pushes the stool in the correct direction, towards the anus and you go to the bathroom. Then another way of peristalsis comes which should push the next bit of stool into the rectum. The reason it doesn't adn instead pushes the stool back in the wrong direction-back up the large intestine- is because of the location of the start of the peristalsis or the squeeze. To push a stool in the right direction the squeeze must begin behind the stool. But in ibs-c the squeeze often starts infront of the stool. This means the stool can be pushed back and forth in the large intestine. The longer it stays in the large I. the hard it will become as more water is absorbed. In people with ibs-d the peristalsis or squeeze is happening in the proper place, behind the stool but it happens too often so the stool is pushed too quickly out of the large intestine without all the water being absorbed.Much of this information does come from the ibs clinic that the mayo clinic runs. I went to the one in Rochester MN. They did all the standard test- colonoscopy, endoscopy, barium swallow, eating a radioactive egg, bloodwork, ct scans, ultrasounds. All came up negative.