I am a 45 year old male, and over the weekend, I started to experience brief, but sharp pains (like a knife) on the left side of my pelvic/groin region. They lasted only a second or two and would occur about once an hour for the first day. Over the past two days, the frequency has dropped off, but they still hit me once or twice a day.

My guess is some sort of kidney stone moving down my lower uterer, but I have had no back or flank pain, and my urine appears normal.

Any other ideas as to what this may be?