Protein Shakes and headaches

I've been taking protein shakes for about 3 weeks and I had to stop for a while, in an attempt to find the cause of my headaches. The headaches are now gone (coincidental with the removal of the protein shakes). I realize this may not be the cause of the headaches, and I will slowly go back to the shakes, but I'll keep better track of my protein so that if I have enough in that day, I won't take a second shake.

As the headaches were not consistent but the protein shakes weren't, I did not suspect the shakes until I realized that I switched between two different flavours, and I did not pay attention to see if the headaches followed a specific flavour. So that may be a possibility.

So has anyone had problems with getting headaches with shakes? Did you find that some flavours were ok, but others weren't? Can too much protein cause headaches?

Thanks for your input!

Tell us where you live and maybe someone has some experience in your neighborhood. <jk>

Seriously, some people get headaches with different flavorings or colorings, with aspartame, with msg, and with whey. So it may not be the protein (although Alex's reply sounds plausible if, to me, unlikely) giving you the headache but the 'shake.'

Check the ingredients on your tub and see if anything jumps out at you. You might try a different brand or unflavored. If you ate the equivalent protein level in chicken breasts or something like that, would you expect to get a headache?

JM2C, Selene finally, a serious reply