I am 18 years old, and in healthy shape. I don't have any health problems, except that I get from time to time really bad lower back pain. I always tend to have pain just in one particular are of my back, which is the lower left part. It feels like a sharp pain and sometimes will "lock" my back, making it hurt really badly if i move to quickly or move in a certain position. Once I had the gotten the pain, I layed down and was arching my back upwards trying to stretch my back and then i heard a loud ''pop" noise, and I no longer had to pain whatsoever. It only occurs in the lower left part, it feels like on that bone. I dont have nausea, or stomach pains or anything like that, just will get that lower left back pain about once a day. I'm wondering if its a slipped disc or something like that, but im unsure of what it is really. I could use some help in figuring out what it is or what i should do. Thanks! :)