Muscle?: Ribs are surrounded by connective tissue, blood vessels/nerves and muscle. The muscles may shift with positional changes and I suspect this is what you are noticing (one sliding under another perhaps). Nothing to be concerned about especially if no pain.
Answered 5/15/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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