What does tingling and numbness in right arm mean?

Tingling and numbnes. this usually has to do with a nerve at some ointment from where the nerve leaves the spinal canal until it inner ares the hand. Depending on what part of the hand is involved depends on which nerve it is. The best thing to do is see you doctor and he can order tests called Nerve Conduction tests that can see where the nerve is pinched and determine treatment from there.
Most likely. Nerve compression perhaps at wrist secondary to carpal tunnel syndrome, but maybe at elbow, due to ulnar nerve compression. An EMG test can pinpoint problem and allow successful intervention.