“Credit Card Itis: A documented syndrome resulting in pain in the rear that runs down the thigh due to pressure on a nerve from a wallet stuffed with credit cards.”
—New England Medical Journal, 1966
Sad But True.
In the early 1960’s as credit cards were making an entry into society, there was an article in the NEJM linking credit cards in the wallet to sciatica!
http://www.nytimes.com/2006/01/17/health/17real.html?_r=0