Inflammation of all arm nerve roots, which may cause widespread pain, weakness, or numbness in the arm and hand.
Medical records that document the severity of your nerve impairment are central to this rating. Nerve conduction studies, electromyography (EMG) results, and physical examination findings showing the degree of motor weakness, sensory loss, or reflex changes help establish whether the impairment is mild, moderate, or severe, and whether function is partially or completely lost. For a higher rating, records showing significant loss of strength, coordination, or sensation in the affected limb or area are relevant. If the involvement is purely sensory, that finding in your records is also directly relevant, because the regulation limits purely sensory involvement to no higher than the moderate level. Statements from you or people who know you describing how symptoms such as weakness, numbness, or pain affect your ability to work, carry objects, or perform daily tasks can help show functional impact. Records noting which side of your body is affected, and whether both sides are involved, matter because ratings differ between the major and minor sides.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.