My MD sez...

As MS patients we as a group tend to have more urinary retention. Urine that sits tends to be more easily infected than urine that moves on through. With spastic issues, sometimes the ureters can prevent urine from leaving the kidneys properly, and then once it finally reaches the bladder, it is already stagnant. Since we tend to have muscle trouble (bladder is a muscle) we either go too much and pee our pants, if we dont control the opening, or we go too little and the already stagnant urine is quick to become infected.

Now, if this is true I dont know, but it sounded good. He went to alot of years of medical school so he could describe pee pee trouble to me.