17. They Developed Health Issues
Astronauts very rarely develop health concerns when they are on a mission yet the astronauts on the Apollo 13 mission were not lucky in this regard. Besides,having to deal with the stress and mental agony of whether they would actually make it home alive or not, the three astronauts also lost weight due to the lack of proper nutrition during the mission.
Haise who was on his first flight mission into space, also developed a bad kidney infection on the journey. Luckily they all made it back alive.