Originally Posted by
Flatballer
dehydrated most likely. Are you just drinking water, or do you have some electrolytes?
When I have a headache after a ride I'll eat a pickle (I do this anyway...) and take an endurolyte pill and I'm good to go.
I eat a clif bar before, bottle of water with one scoop of G2 powder an hour, and a Gu packet. I had always thought it was the heat, but I got out early today and still have a brutal headache.