Drinking too much could cause distension of the bladder and will just increase the urge to urinate.

An obstruction that occurs at the urethra or bladder outlet can cause pain and pressure resulting from distension of the bladder.

The size of this fossa is dependent on the state of distension of the bladder; when the bladder is empty, a variable fold of peritoneum, the plica vesicalis transversa, divides the fossa into two portions.

It is also important to ensure that adequate distension of the bladder occurs as some fistulae do not leak at small volumes; conversely, some fistulae with an oblique track through the bladder wall may leak at small volumes, but not at capacity.