I woke up with tingling and numbess in my left hand with vein bulging. what could it be?

My not be vein.: Common caused of tingling and numbness in the hand are usually related to nerve problems such as carpal tunnel or ulnar nerve irritation. The bulging vein may have no relationship to the tingling and numbness. Other causes of your symptoms could be arterial with decrease blood into the hand but this would not cause a vein to bulge. You should certainly follow up with your physician.

A different take:: It's a mistake2 discard the fact that all the complaints came about in the same time.Tingling, numbness is a peripheral nerve irritation. The simultaneous congested vein should suggest the possibility common reason: thoracic outlet syndrome caused by a cervical rib, scalenus anticus syndrome, etc. Etc. The best is to be examined by a vascular surgeon asap mainly if the symptoms persist!