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Why is backpain such an epidemic in America?

It seems almost every American has daily backpain, including me and I'm only 16 years old. What is it about the back that everyone has problems with, and not any other body part?

Public Comments

1. Because as a species, we havent been walking upright for very long. Evolution works very slowly.
2. Cause we are always picking up other country's problems.
3. With alot of people it has to do with there weight. There not made to carry that much extra weight.
4. well because people carry around to much junk. they either over weight or just carry to much in bags(backpacks) so that is what is wrong with your back.