1. Patients with kidney stones
Did you know that forcing fluids during an episode of renal colic can make the pain worse?

2. Night-time Urination
Did you know that frequent urination at night may not be always due to an enlarged prostate? It could be a result of fluids accumulating in the legs during daytime. The volume of liquids will, once the patient is laying down, go to his kidneys, then to the bladder, and fill it up so that the patient has to void several times.

3. Inability to Void
If a patient is unable to void, he should stop drinking, because this will make things worse. The concept of putting more fluid in the bladder to push it through is obsolete and actually counterproductive.