Hi I have an enlarged prostate two weeks ago I passed four kidney stones now every time I pass urine I get a burning pain in my bladder?

May Have Infection. You may have an infection in your bladder or maybe some of the stone material is still in bladder. You need to see your doctor and be checked. Meanwhile i recommend you drink 6 oz. Cranberry juice and over one quart of water per day. Good idea to take magnesium citrate or magnesium malate once daily as it helps prevents stones. Did you get the analysis of the stone constituents results?
Passing stones . Passing stones through the urethra can result in irritation or abraison that results in painful urination for several days following. It's also possible that a small stone is stuck in the prostatic urethra.