numbness and coldness in the arm

[jennylynnhere]

So I love being outdoors. Running, hiking, walking, tennis, etc. But lately, when I run, or do something active, my arms go numb veins bulge out. One time I was even hiking and my arms turned ice cold and I became extremely dizzy. (i had plenty of water so i wasnt dehydrated) I don't understand when this is happening. I've been told it could be from a heart disease? I'm only 22yrs old so this is nuts. Anyone know why this is happening?

[kenkeith]

I don't see how it can be anything but a blood circulation problem, and or nerve malfunctionality.  Raynaud's is a disorder that affects the blood vessels in the fingers, toes, ears, and nose. This disorder is characterised by episodic attacks, called vasospastic attacks, that cause the blood vessels in the fingers and toes to constrict and reduce blood flow.
Excess sugar in your blood (diabetes)can lead to nerve damage. You may notice tingling and loss of sensation in your hands and feet, as well as burning pain in your arms, hands, legs and feet.

Worst case scenerios and you should see your doctor and get a medical opinion and tests to rule out.