when is there HP damage for avoiding urination (Quick and Dirty Enchantment)

[Agemegos]

I had a tangentially relevant conversation once with an intensivist, an anaesthetist, and a surgeon (no urologist), discussing the famous death of the Danish astronomer Tycho Brahe. The consensus of the doctors was that Brahe must have had [some condition that they named but that I have forgotten], because normally the sphincter fails before the bladder does. You cannot injure yourself just by refusing to pee.