Hello, I am 8 weeks post RP surgery and am having the same burning issue with my penis. I did have a UTI but that has been resolved and have had multiple negative tests since. I also have pain that radiates into my penis when I sit on hard surfaces as well.
My Dr wanted me to get a CT scan to rule out any infections, ascites, fluid buildup, or lymphadenopathy. Results were all negative.
I also have a very active bladder and urine frequently. I believe I have a stricture in my urethra as my flow is weak and breaks into two streams. I go to have a Cystoscopy in 4 weeks for an official diagnosis. I am currently chalking the burning sensation to a potential stricture. I don't know what else it could be... Maybe I need more time to heal. I am 52 years old.