Cervical rib: An extra rib that arises from the seventh cervical vertebra. It is located above the normal first rib. A cervical rib is present in only about 1 in 200 people. It may cause pinching of nearby nerves or arteries, in which case it sometimes is removed surgically.
Quick GuideLow Back Pain: Symptoms, Causes, Treatment, Relief
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Last Editorial Review: 6/9/2016