List of 18 medical conditions that may see you banned from flying including pregnancy - see full list - Yahoo News UK

ARLINGTON, VA - NOVEMBER 27: Passengers move through Ronald Reagan National Airport on the day before the Thanksgiving holiday, November 27, 2019 in Arlington, Virginia. Both the American West and Midwest are facing significant weather events that could impact travelers. (Photo by Drew Angerer/Getty Images)

A travel warning has been issued over 18 medical conditions that could potentially see you banned from flying. Some illnesses that would stop people from taking off are well known and obvious, but some not so.

The World Health Organization states: "Airlines have the right to refuse to carry passengers with conditions that may worsen, or have serious consequences, during the flight.

"They may require medical clearance from their doctor if there is an indication that a passenger could be suffering from any disease or physical or mental condition that could be a hazard to the safety of the aircraft, reduce the welfare and comfort of the other passengers and crew members, require medical attention during the flight, or may be aggravated by the flight.

"If cabin crew suspect before departure that a passenger may be ill, the aircraft's captain will be informed and a decision taken as to whether the passenger is fit to travel, needs medical attention or presents a danger to other passengers and crew or to the safety of the aircraft.

"Airline policies vary and requirements should always be checked at the time of, or before, booking the flight. A good place to find information is often the airline's own website."

According to Fit For Travel, run by the NHS, air travel is not normally advised in the following cases:

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