4 mm kidney stone no more pain in back but severe pain in penis. i have good flow but it hurts after flow slows down. been drinking ton of water..

Kidney stone: The stone has moved down the ureters and through the bladder and is in the urethra. The pain is referred to the genitals.

Here are some ....: Clinically, you're more than half way through the ordeal of passing the 4-mm stone; hopefully, it will flow out well with urine shortly. But, don't forget straining urine and retrieving the stone for documentation if passed so to bring it to urologist for stone analysis if you have never had a stone analyzed. Generally speaking, some 85% of stones may pass spontaneously in about 2 weeks.