could be a possibility of Hirschsprung's Disease which is a section of dead nerves in the colon. when fecal matter reaches the dead nerves, there is nothing telling the brain to send impulses to the muscles to keep it moving so it starts to back up. if you have a good diet with lots of fiber, it helps to keep it moving but leakage is common. my ex husband has this and unfortunately, passed it on to our son who is now 17. my son had a lot of problems with getting it under control in elementary school and accidents were frequent then. he's getting along fairly well now and keeps control with his diet. my ex has it so bad that he would average one bm a week and would drop football size bm's with some blood on the matter but not in the toilet. he has passed out a few times and been woozy others and need help leaving the bathroom. check available materials on this and see if anything listed applies to you.