Does anyone else get fevers on long flights? I've flown 3 RT international flights in the last year, and felt feverish on all of them. A low fever, but keeps me from sleeping unless I take tylenol. I can't find anything on google (possibly bad air quality or mild altitude sickness?) and am not sure if my body is just insane. This never happens on domestic or shorter flights. The fever starts a few hours into the flight, and ends 2 hours after the flight (just long enough to make customs miserable).

Welcome to FT!

I noticed our leg HOU-CUN, the sun was unusually hot aganst the plane, and cabin temperature soared.. same thing but to a lesser extent CUN-LAX..

Perhaps the radiation has something to do with it, and how your body reacts to it.. but just a theory..

It could be a form motion sickness. Not all motion sickness presents as nausea.

Some symptoms include confusion, headache, diarrhea and fever.

NASA also mentions "the space stupids", something experienced by both astronauts, pilots and commercial airplance passengers which is a mild form of confusion and slow response generally brought on by fluctuating g's (turbulence, speed changes) and slightly off pressure settings.

Some physiolgists suspect that the near 0 humidity causes a feeling of dryness in the nasal passages which then fools the brain into initiating a histimine response. In otherwords, your brain suddenly thinks you have a cold and starts up a fever (remember, fevers are not part of the disease, but a defense response to a disease)

I sometimes get this too, but only in flashes and it does not last.