My penis has been burning for awhile now. After urination it feels better but the head gets very irritable as if it was dipped into hot water. I went to the doctor thinking I had a urinary track problem, but the urine sample came back negitive. The on call nurse told me to stop drinking caffeine, I did and that made things much better. If it's not a urinary track infection do you have any idea what might be causing it? i'm not sexually active.