Take a guess as to what the leading cause of disability in America is? Go ahead. We can wait. The title of this post is a clue, of course. But if someone stopped you on the street and asked, what would you answer? Heart problems and cancer are certainly up there as reasons to miss work, along with diabetes. But the actual answer is arthritis. 54 million people in the United States have some form of the disease. Are you one of them? Do you have arthritis?