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chest xrays don't show very much.
you should get a chest CT scan and a spine MRI scan to look for pinched nerves which can cause pain.
you could have inflammation of a rib there
or chronic inflammation of muscle there like a myositis inflammation of muscles.
a chest CT scan can look more detailed in the lungs to check for pleural inflammation of the lining of the lungs which can be missed on chest xray.
it doesn't sound like you have had a chest CT scan or MRI scan yet.