Im experiencing numbness or like lack of blood feeling in my left arm starting from upper going to the forearm. whats the possible cause? no history heart

Nerve pinching: You could have ulnar parasthesias associated with thoracic outlet syndrome, however there are other explanations. A vascular surgeon or neurologist might be best type of doctor to diagnose. An upper extremity arterial ultrasound can be diagnostic of thoracic outlet syndrome, a disorder i describe on my chronic pain board at quora.Com.

Pinched nerve: You could have a pinched nerve. The nerves have several places from the neck to the hand where they can get compressed. This isn't an emergency, but it is a good idea to get an evaluation so you can get this treated.

CONSIDER: Nerve compression in neck, thoracic outlet syndrome, radial nerve at upper arm (spiral groove), ulnar nerve at elbow (cubital tunnel) or median nerve at wrist (carpal tunnel). Hopefully, not a sign of cardiac ischemia. Talk to your doctor, maybe get EMG test.