It actually makes sense to me; since the bladder and rectum are packed so closely together, you may have an issue where one is holding up the other. For me, it's the opposite; emptying my bladder opens up my bowels! I'm not an expert in physiology, just speaking from personal experience. There may be a nervous system connection, but all I know is what I can read from reputable sources. Have you tried Mirilax (PEG 3350)? It can do a great job of keeping the constipation at bay. Good luck, hope this helps! 🙂