LEFT body pain 24/7 for 8yrs. No pain on right. Brain/Spine MRI -ve. Pain absent during menstrual. Does this give any clue for root cause & treatment?

No. No, that the pain has not progressed over a period of 8 years would suggest that whateverr is causing it is benign. Since it is only left sided I would think of someing central in the CNS.

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LEFT body pain 24/7 for 8yrs. No pain on right. Brain/Spine MRI -ve. Pain disappears during menstrual & reappears after. No doc found cause or lower pain?

Sounds complex. I do not think we will be able to answer this in 400 characters since it has been 8 years and you have seen multiple doctors. I would start with your primary care doctor to go through what tests have been done so far and to help organize a plan for further evaluation and testing. Let the primary care doctor coordinate the various referrals for you. Read more...