Old thread, but the first time I ever took creatine I got mild headaches, felt more like my head was swelling. And pretty sure that was jsut during the loading phase. I no longer ever load or cycle. if I want to be on it im on it, takes a little longer to be full concentration in your system but its fine, and when I dont feel like taking it anymore I stop till whenever. Haven't taken it in a year, but make best gains on it.