In most cases, there isn't a clear cause for back pain. It may be related to problems with muscles and ligaments of the back. It may also be related to problems with the nerves, discs, or bones of the back. Moving, lifting, standing, sitting, or sleeping in an awkward way can strain the back. Arthritis is another cause of back pain.
Although it may hurt a lot, back pain usually improves on its own within several weeks. Most people recover in 12 weeks or less. Using self-care, such as ice or heat and light activity (like walking) may help you feel better sooner.