How would a tick bite cause dehydration? I live in an area rife with ticks and I do a lot of hiking, so I've been bitten by ticks probably over a hundred times. Other than a little localized inflammation at the bite site, I've never experienced any sort of symptoms whatsoever from a tick bite, and certainly not an increase in afib. Dehydration is a powerful trigger for afib, so if your afib is worse it's likely due to the dehydration rather than the tick bite.