Back Pain : What is the cause of non-specific low back pain?

What is the cause of non-specific low back pain?
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Non-specific low back pain means that the pain is not due to any specific or underlying disease that can be found. It is thought that in some cases the cause may be a sprain (an over-stretch) of a ligament or muscle. In other cases the cause may be a minor problem with a disc between two vertebrae, or a minor problem with a small facet joint between two vertebrae. There may be other minor problems in the structures and tissues of the lower back that result in pain. However, these causes of the pain are impossible to prove by tests. Therefore, it is usually impossible for a doctor to say exactly where the pain is coming from, or exactly what is causing the pain.

To some people, not knowing the exact cause of the pain is unsettling. However, looked at another way, many people find it reassuring to know that the diagnosis is non-specific back pain which means there is no serious problem or disease of the back or spine.