80% of the population gets low back pain at some point in their lives. The vast majority of this pain has a muscular cause. Although it may feel sharp and stabbing and feels like nerve pain, it is typically localized to the muscles of the central spine, whereas actual nerve pain and sciatica radiates from the buttock down the leg. Most of these episodes are short-lived and can be managed with a couple of weeks of supportive care, physical therapy, rest and muscle relaxers. However, if these measures are not enough you should come in and be evaluated.