The most important thing you can do if you feel yourself getting sick before setting off on a trip is rest. When you sleep, your body is more able to fight off infections – so get as much sleep as you can!
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Step 1: Judge your sickness.Generally, you should also bag a trip if you have a fever higher than 100 degrees Fahrenheit and symptoms such as coughing or sneezing, says William Schaffner, M.D., a professor of infectious diseases at the Vanderbilt University Medical Center.
It is recommended that if you have a cold that you do not fly; this should be enforced by airlines in the case of aircrew, and aircrew are required to self-report any symptoms of cold, flu, or similar.
An airline can deny boarding of any passenger who looks unwell, especially if they suspect the passenger might be infectious (infect other passengers).
If you fly with a head cold or seasonal allergies, Dr. Pinkston said it's possible you may significantly stretch your eardrum because your Eustachian tubes wouldn't be working properly to equalize pressure. If the stretching of the eardrum is considerable, these problems may occur: Capillaries in the ear break.
In most countries, you can call 112, the European Union's universal emergency number for ambulance, fire department, or police. Most countries also have a 911 equivalent that works as well. Or you can ask your hotelier, restaurant host, or whoever's around to call an ambulance (or a taxi for less dire situations).