re: OT Doctors: Lower back/buttock pain, Cluneal nerve pain/swelling.

quote:

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Localized.

Lower left back and left buttock. Swelling/knot is just below the belt line.

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Yeah. Downbythebayoubengal sounds like he is on the right track. It isn't piriformis syndrome and probably isn't a herniated disc. If it were, the pain, numbness, and/or "pins and needles" would radiate down your leg as some here have been describing. You should go get it checked out.