I have no symptoms until late afternoon or evening. At that time I feel an urgent need to move my bowels, but after much straining, all that comes out are very small stools, mucus or gas. This happens repeatedly along with constant loud gurgling and rumbling in my colon and a very uncomfortable feeling of liquid and/or gas moving backwards. This lasts for several hours until I go to sleep. This happens regardless of what I've eaten and doesn't seem to be stress-related. I eat a very healthy diet, but I know that I don't always drink enough water. Do you know of any reason why I have symptoms at that time of day and no other time?