I have been having little numbness and weakness in right hand from few days. When I hold anything with right hand or lift the hand I could sense weakness in it. 4 days ago I had a blood test done where sample was collected from the same hand. I have pointing pain in frontal bicep area when hand is folded. No swelling anywhere. Even if I lift empty hand also I feel weakness. Earlier few months ago I had cervical disc bulge in c4 c5 and c5 c6 which caused pain in right shoulder and hand. With physiotherapy it got reduced. Now this weakness and little heaviness is there throughout the hand when pressure is applied on the hand or held any objects. Does blood test cause this for days or is it because of cervical disc bulge which is causing this. Apart from this I have burning sensation throughout the body, earlier I had b12 deficiency as well. When I fold my hand at elbow little weakness can be felt from elbow. If I fold from wrist same can be felt. Please advise.