Well this can be connected with ulnar nerve. If you have injured your elbow in some way than you might have done something to ulnar nerve. And now it is doing this to your hole upper arm.
Do you lift any weights? Do you exercise involving your elbow too much? This also can be if you do not move your elbow a lot and you hit your self on it. This can cause disorder like this.
If you experience this again that good thig for you would be to go and see a doctor.
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