Not ulnar nerve: Sounds like Thoracic Outlet Syndrome may be involved. Ulnar nerve does not affect the forearm - that is C8 nerve root. Thoracic Outlet syndrome can cause your arm to swell, if the blood vessels are involved. See a Neurologist that is well versed in Ulnar neuropathy, Neurogenic and Vascular Thoracic Outlet Syndrome...
Answered 5/28/2014
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