Ultrasound showed hydronephrosis after 2 kidney infects 16 months apart. severe swelling on right, possible mild on left. antibiotics relieved pain. u/s could not identify blockage. likely stone, cancer, or something else? ct on monday. 35 y/o f.

See a urologist: This is a more complex issue that can be dealt with here. You really need to be seen by a urologist. Recurrent hydronephrosis is something that needs to be evaluated by a specialist.

Multiple possibility: More info would be helpful, like ? blood, how is your urination, etc. If both sides are blocked, that usually means the problem is in the bladder or prostate. Could be swelling of the bladder inlet from residua of the infection, thickening of the trigone from tumor, bladder stones or prostate infection. You need an exam by a urologist for this, but they will want to know the CT results