I think the term "sciatica" refers to any pain caused by pressure or irritation of the sciatic nerve. The nerve extends from the brain stem all the way to the foot. The pressure can be caused by a bulging or herniated disc, or by bone deposits caused by arthritis. The pain can be felt anywhere along the nerve, even remotely from where the pressure occurs. I had a herniated disc in my lower back years ago that caused severe leg pain. It was diagnosed with an MRI. I had surgery, and the pain is gone, but I really don't know if the surgery was the cure, or just time. But, I don't think physical therapy will help much. If you can get an MRI, it may show where the nerve is being compressed. Good luck.
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