My left leg hurts so much I can hardly sit still. It s a throbbing pain mostly in the back of my thigh that radiates down to my foot. It has come and gone since this afternoon. I have nerve damage on my left side from neurosurgery 16 years ago and have weakness on that side. I have this pain every so often, then it goes away through no action on my part. Sitting, standing, or laying down doesn t alleviate it.