What causes tingling fingers and pain in the left arm?
heart attack comes to mind, possibly an auto immune attack as well, but then again it could be that your left arm is being crushed by a large weight and you are losing sensation in that arm as it is dying.
go to a doctor.
Tingling fingers and pain in the left arm are most probably due to a herniated disc in the cervical region. I have herniated disc between C5 through C7 and experience tremendous hand tingling as well as numbness in my left arm with pain. I also have heart disease and this discomfort is totally different. First of all I get relief by adjusting the position of my neck. Also with cervical disc problems one typically has at least a slight soreness in the back of the neck. Tingling and pain in the arm can also result from carpal tunnel syndrome. A quick MRI of the cervical region can diagnose cervical disc problems. Good luck