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Why and How Do Astronauts Get Sick in Space?

Spaceflight presents a myriad of challenges for the human body and health. Learn how experts are working to lessen the side effects for future astronauts.

Katie Liu
ByKatie Liu
A female astronaut testing spacesuit camera and listening to instructions during pre-flight preparationCredit: Frame Stock Footage/Shutterstock

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Apollo 7 sent a trio of astronauts into space in 1968, making it the first crewed flight of the Apollo Program. But about 15 hours into the flight, astronaut Wally Schirra began developing the symptoms of a bad head cold, with the rest of his team following suit. Balancing a fog of symptoms, including sniffles and congestion, on top of their heavy workload was a recipe for misery.

Considering the extensive training and screening astronauts go through to ensure they’re in optimal health for missions, it may seem ironic that they’re also more likely to get sick while in space. Luckily, researchers are working hard to understand the ways and reasons why astronauts get sick, as well as how to mitigate those risks for present and future space exploration.

Different kinds of clinical events manifest in space, according to NASA immunologist Brian Crucian. There are colds, sore throats, abnormal allergies ...

  • Katie Liu

    Katie Liu

    Katie Liu is a science journalist who writes for Discover Magazine, covering scientific studies on human health, archaeology, the environment and space exploration.

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