As a Massage Therapist, I've had wonderful results with performing the "Wallet-ectomy" (well, having my clients do it anyway...).
The wallet, in the back pocket, usually is situated right over a deep muscle called the piriformis. The sciatic nerve runs directly under, over, or sometimes through the piriformis (depending on the person) and any irritation to the piriformis can impinge on the nerve causing pain down the leg.
So guys, do yourself a favor and carry stuff in the front pockets.
Or you can pay a Doctor or Therapist their fee (keeping us in business)
and we'll eventually help you "deflate" that wallet enough that it doesn't bother you so much.
Hey, I'm just this GUY...you know?
>>>Team Critical Mess<<< (You mean it's not SUPPOSE to hurt?)
My nice new Nashbar Touring Build AKA "The Flying Avocadooooooooo!"
1998(?) Trek 700 Multitrack
1995 Trek 1220 AKA "Jimi"
Older Non-suspension Specialized Hardrock