Getting headaches from weightlifting happen for a couple of important reasons. First off, you must make sure to properly breathe throughout your workout. Unstable breathing or
… incorrect breathing can be fatal to the amount of oxygen your brain and body have access to. A second thing to make sure of is that when weightlifting you aren't straining yourself. Excess strain from lifting too heavy of weights can really put your body into unhealthy and damaging conditions. Overall, make sure you are drinking plenty of water and following the standard weightlifting health standards. ( Full Answer )