Pain in the tailbone can sometimes be caused by sciatica. When this is the case, the pain is not caused by inflammation, so it's not coccydynia. Sciatica is a condition that causes pain to radiate along an individual's sciatic nerve, which begins in the lower back and branches out and downward, traveling through the buttocks and hips and moving down each leg. In most cases, sciatica only occurs on one side of the body. The condition most often happens when a spinal bone spur, narrowing of the spine, or herniated disk lead the sciatic nerve to be compressed. In addition to pain in the tailbone, this can cause the sciatic nerve to become inflamed. Pain may radiate through the lower back and hip on the affected side. The affected leg might also be somewhat numb.
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