Low back pain

Low back pain or lumbago is a common disorder involving the muscles, nerves, and bones of the back, in between the lower edge of the ribs and the lower fold of the buttocks. Pain can vary from a dull constant ache to a sudden sharp feeling. Low back pain may be classified by duration as acute, sub-acute, or chronic.

The condition may be further classified by the underlying cause as either mechanical, non-mechanical, or referred pain.
The symptoms of low back pain usually improve within a few weeks from the time they start, with 40–90% of people recovered by six weeks.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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