Why the hell does my back hurt so much? It's all stiff, and bending over tends to result in unimaginable agony. All I know is that it's not cramps, and I'm too young for rheumatism. So what is it? Did I sleep on it the wrong way? Bang into something and not notice? Get kidnapped by aliens who decided to inflict physical damage on me and see how I react? I really hate being a medical mystery!