the key phrase in your question is this: "i was playing video games at the time. " since the numbness is confined to the tip of your thumb chances are you're suffering from a repetitive motion injury. any activity that involves the same movement of the hands and fingers over and over again can cause irritation of the nerves that supply them. in the extreme this can cause loss of movement and severe pain. in your case it sounds like you may have irritated a nerve that carries sensory impulses to the brain. that tiny nerve ending apparently has stopped working. the good news is if this is indeed a repetitve motion injury you can improve the situation by resting your hand for awhile. avoid playing any video games and see if the situation improves. if not see your health care provider for further evaluation. just to be clear the warning signs of a heart attack in men generally include a crushing or squeezing sensation in the middle of the chest chest pain pain or numbness radiating down the left arm and/or into the left jaw shortness of breath faintness or nausea. and don't think just because you're only 19 years old that a heart attack would be out of the question. while it's unlikely a heart attack can strike people of almost any age particularly if they're sedentary and/or overweight.
the tip of my left hand thumb has been numbish for 2 days can you explain what could be causing it? . it randomly happened yesterday. i'm 19 years old and i was playing video games at the time. this never happened to me before though and i'm stumped. first i thought it was like a heart attack warning and i scared myself but the feeling was only contained to my thumb. it feels kind of like how it feels when you burn your skin but i know i didn't burn it. seriously stumped.