There is a condition called megarectum and left untreated can cause permeate nerve damage. High fiber not good idea for this condition. MAYBE THE FLAXSEED OIL BUT NOT SURE. Google it. my sons dr wanted to put him on miralax for a few months to keep stools soft and retrain rectum. He got severe leg cramps from it. I am going to try the flaxseed suggestion and the magnesium supplements. My son has had this issue for so long and I kept telling his dr. They just ignored me saying good he has healthy bowels. This condition can prolong nighttime bed wetting too. Go to a gastroentonologist for evaluation.