I don’t think pouchitis directly increases urination for most of us. Some of us choose to urinate every time we have a bowel movement, and pouchitis certainly increases the frequency of those. Sometimes the sensation of fullness in the pouch can be associated with a sensation of fullness in the bladder (or vice-versa). And sometimes our water drinking habits will change when other things are going on with our bodies. Our bodies will each have unique (and sometimes confusing) ways of delivering these messages to us.