Most men carry their wallet in their back pocket. Often the wallet is at least an inch thick with cash, cards and receipts. When you sit on that wallet it raise one hip by the thickness of the wallet. Your hips out of alignment cause your pelvic muscles to compensate and, further up your spine, your shoulders cantilever the other way to compensate.

How do I know this? I used to be a call-out technician who drove many hours for a living. After several months of driving, I had pains in my lower back and a very sharp pain in one side of my bottom and a large bruise to go with it. It always felt as if something sharp was poking into my buttock.

First I checked the car seat thinking there was a spring or bolt that was poking into me but nothing. Then I checked with Doctor's and Chiropractor's as to the cause and they explained to me that it was sciatic pain caused by pressure on the sciatic nerve which runs from the pelvis to thigh. They wanted to give my pain killers and operations to release the nerves.

Thankfully, a bit of common sense kicked in when I realised that I was sitting on my wallet the whole time I was driving. When I took my wallet out of my back pocket and put it in the console or the glove box within just a couple of days the pain and bruising went away.

This strategy also applies for everyone who sits at a desk all day for a living. Place your wallet in a desk drawer or on the table in front of you. It takes only a little while to form the habit of remembering where you put your wallet when you take it out of your pocket, and also remembering to pick it up on the way out of the car or office.

But you don't have to do go through the hassle of forming a new habit if you don't want to. You can instead spend hundreds maybe thousands of dollars on expensive therapies and operations to relieve back pain and that will reduce the size of your wallet achieving the same end result. The choice is up to you.