High heels hurt. If you’ve worn them then you probably know this already. But are high heels also bad for you? According to Time Magazine, A 2014 survey from the American Podiatric Medical Association—composed of the nation’s top foot and lower-leg docs—found heels were far and away the most common cause of foot pain among women. The studies found that high heels can cause short term problems with your feet but the most significant risks of your high-heel habit may begin higher up your leg. According to research, lots of time spent walking in heels actually changes the structure of the muscles and tendons in your calves—and not for the better.