Why Do Astronauts Have Back Pain? Living in zero-gravity for months at a time might sound like a thrilling adventure, but the majority of astronauts experience moderate to severe back pain as well as numerous other health risks while in space.
Space sickness affects up to half of the astronauts during their first few days on the space station. The vomit could smear the inside of the helmet, blinding the astronaut. And because it could not be removed, it could be inhaled or clog their oxygen circulation system.