I am 18 years old and still in high school. I usually crack my back by pulling the back of chair and twisting my spine; I do this several times a day, at least each class period and much more at home. Yesterday, I was in class and my back ached a little bit, but as the day went on it got severely worse. By the time I was in my 7th class period, every step I took would shook pain up my back on the right or left side. Every moment hurt. I wa hoping it would be gone today. I was rudely reminded when I tried to get out of my bed this morning and was wakened my pain causing me to fall to the floor. Laying on the floor makes the pain disappear for the time being, but trying to get up is the worst pain I've ever felt in my back. This has happened one other time and it went away in a few days, but I want to know why this happens, and if it is preventable.