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I think I might know the answer to this one, but every time I swim I get a headache. It's gone shortly after stopping - usually by the time I'm showered and dressed. As I'm swimming more and more in prep. for IMCH, it's a growing issue?
Is it dehydration? I don't suffer when I do long runs or rides so I'm surprised about this. Only other things I can think of are goggles too tight (??) or chemicals in the pool.