Sometimes stubborn back pain just won’t seem to go away — no matter how much you stretch and sit up straight. But the cause of all those aches might not be what you think, so we’re sharing three surprising causes of back pain and how to feel better.  To support more content like this, become an AARP member at aarp.org. And don’t forget to subscribe for more tips and tricks to help make your life a little easier — and happier!