Strained back

According to Wikipedia, strained (back) is "an injury to a muscle in which the muscle fibers tear as a result of overstretching". And it also says "Typical symptoms of a strain are localized pain, stiffness, inflammation, and bruising around the strained muscle." These are exactly what I feel with my back. Interestingly, it's not trouble of neither nerve system or back bone. It's just an inflammation of muscle supporting pelvis. I thought it's a serious injury of back bone, but it wasn't true. I feel easy with my back now. Just I hope my back will be fine soon.