Is it ok to drink lots of water if i have mild hydronephrosis?

Hydronephrosis: Probably not, if you have unilateral hydronephrosis (h). Your unaffected kidney should be able to excrete a water load. See a urologist to see what is causing the h and see if it can be resolved.

No problem: Hydronephrosis is swelling of the part of the kidney that drains urine. Mild hydronephrosis can be a normal finding, particularly if found incidentally and you aren't having a symptoms of kidney pain (flank pain, nausea/vomiting). However, only a urologist can determine if this is benign or clinically important. I would see a urologist but you don't need to limit your water or fluid intake.

Probably: In general, hydronephrosis is caused by either partial obstruction of the ureter or bladder, by reflux up the ureter from the bladder, or by large urine production. Excessive fluid intake may exacerbate this condition. It is important to have an evaluation to understand its cause and to determine the best means of observing it for deterioration.