Doctors Warn Against Flying If You’re Experiencing These Symptoms

“A delayed flight is inconvenient, but a medical emergency at 35,000 feet is a much bigger problem,” one doctor said.

Air travel can be taxing in general: the long security lines, flight delays, dry cabin air, uncomfortable seats and rude passengers. But when you’re not feeling well, flying can be an even more unpleasant experience.

You may wonder which symptoms are mild enough to travel with and which symptoms mean you should probably consider adjusting your plans (as inconvenient and pricey as that can be) for your own comfort and safety, as well as the health of the passengers and crew around you.

And given the record-breaking flu season across the United States, these concerns are top of mind right now. We asked doctors which signs of illness warrant postponing a flight in their view; here’s what they advise and why. (And of course, you should always consult your own health care provider for personal guidance or medical advice).

When you have a fever.

If you have an illness with a fever — defined as a temperature of 100.4 degrees Fahrenheit or more — you probably shouldn’t be getting on that flight, all three of our experts said.