Headache working out

Been pushing a lot more then normal lately in the gym, and well getting head aches only when lifting heavy, when I put the weight down it fades away. I'm thinking it might be insulin getting low, because it only happens after being there for abit not...

when I first start lifting heavy. Anyways, any idea's on what might be causing this? My guess is insulin... thanks

maybe youre not taking enough breaks or drinking enough water...?

I was thinking of the water to, but I drink almost a gallon before going and almost another one after, way more then anybody else... and my breaks are all timed, I might try more water or abit more time.

 
You might want to schedule a complete physical. You could have something wrong in your brain or body that is causing the headaches (a warning) when you are excessively stressing yourself.

Don't take chances with your health!