Related by context. Frequent words. (Click for all words.) 47 vomiting 45 nausea 41 zero gravity 40 weightlessness 39 spacesuit 37 motion sickness 37 vomit 36 capsule 35 fainting 34 NASA 34 headaches nausea 33 Nasa 33 microgravity 33 astronauts 33 nausea vomiting 32 vomited 32 astronaut 32 disorientation 32 dehydration 32 nauseous 31 nausea vomiting diarrhea 31 simulate 31 simulated 31 airlock 31 abdominal pain 30 vomiting diarrhea 30 drowsiness 30 diarrhea 30 puking 30 lunar lander 29 NASA astronaut 29 cosmonauts 29 dizziness 29 Skylab 29 diarrhea vomiting 29 stomach aches 29 constipation 29 breathlessness 29 stomach cramps 29 hemorrhoids 28 lunar module 28 bloating 28 weightless 28 respiratory distress 28 stomachache 28 lightheadedness 28 spacecraft 28 diarrhea fever 28 rashes 28 rapid heartbeat 28 lander 28 severe abdominal pain 28 spaceship 28 space shuttle 28 indigestion 27 Lopez Alegria 27 coughing 27 laxatives 27 muscle cramps 27 mouth sores 27 Space Agency 27 dehydrated 27 sleeplessness 27 abdominal pains 27 orbit 27 spacesuits 27 blurry vision 27 nosebleeds 27 urinary tract infection 27 simulating 26 Apollo astronauts 26 Astronauts 26 nauseated 26 severe diarrhea 26 altitude sickness 26 orbiter 26 irritable 26 falling asleep 26 fevers 26 symptoms 26 labored breathing 26 dyspepsia 26 itchy eyes 25 difficulty breathing 25 Orbiter 25 spacemen 25 seasickness 25 thruster 25 urinate 25 Mars rover 25 severe dehydration 25 bowel movements 25 Eileen Collins 25 throat irritation 25 spacecrafts 25 fever chills 25 International Space Station 25 backache 25 liftoff 25 dizzy 25 irritability