Trigger points in the piriformis muscle are a frequent cause of sciatic type pain.
So called piriformis syndrome typically starts with numbness or pain in the buttock region. In many cases pain will be severe and extend down the length of the sciatic nerve.
The pain is caused by the piriformis muscle compressing the sciatic nerve.
Trigger points in the piriformis act to make the muscle tight and shorter which in turn may create pressure on the sciatic nerve.
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