MIllions of Americans are afflicted with lower back pain every day. And many of them find themselves saying “Oh no, I’ve thrown out my back!” But what does this mean? Throwing out your back is a circumstance in which a painful, debilitating spasm in your back occurs suddenly, out of nowhere, causing your back to seize up. It can be caused by a forceful exertion such as moving furniture, or even something as simple as a sneeze. The pain can be described as a twinge of discomfort to an intense pain that prevents you from being able to move. The pain and discomfort will last usually until the muscle relaxes on its own and the swelling and inflammation go down.