Nonspecific back pain refers to pain in the back due to an unknown cause.

Back pain is one of the most common complaints treated by physicians. Nearly four out of five people will have back pain at some time in their life. Most of the time, the exact cause of the pain can not be found.

Back pain can develop in association with a number of causes, including muscle strain, injury to the back, overuse, muscle disorders, pressure on a nerve root, poor posture, and many others. Pregnant women, smokers, construction workers, and people who do repetitive lifting all have increased risk of back pain. (See also low back pain).

• Low back pain
• Pain in any part of the back
• Pain may radiate to the buttocks or upper leg(s)

A physical examination focused on the back, the abdomen, and the extremities may confirm back pain or muscle spasm, but the examination does not reveal a specific cause (such as a herniated disk) or any neurological problem (such as weakness or change in sensation).

X-rays of the spine are usually normal. Further work-up may include a CT scan or MRI of the spine.