Yeowch! It hurts to bend those fingers, that knee, or to get up from the couch these days. Could it be arthritis? And what does that even mean? There are so many types it's confusing. It's confusing because arthritis isn’t a single disease. In fact, it's -several different conditions- that cause pain and inflammation in the joints in different ways and for different reasons. Osteoarthritis and rheumatoid...