Related by context. Frequent words. (Click for all words.) 60 nausea 51 drowsiness 51 vertigo 48 migraines 48 dizziness 47 claustrophobia 46 jet lag 46 leg cramps 46 heartburn 45 constipation 45 migraine headaches 45 zero gravity 45 weightlessness 44 indigestion 44 cramps 44 irritable bowel syndrome 43 acid reflux 43 frostbite 43 pain 43 hallucinations 42 insomnia 42 allergies 42 disorientation 42 headaches 42 fatigue 42 vomiting 42 hay fever 42 sunburn 41 discomfort 41 sickness 41 deep vein thrombosis 41 nauseous 41 fainting 41 numbness 41 allergic reactions 41 chronic pain 41 nausea vomiting 40 vibration 40 arthritis 40 hypoglycemia 40 blurred vision 40 rashes 40 tingling 40 colds 40 dehydration 40 allergic reaction 39 sleep apnea 39 cravings 39 abdominal pain 39 blisters 39 tiredness 39 blood clots 39 narcolepsy 39 gastrointestinal 39 fevers 39 cramping 38 whiplash 38 diarrhea 38 aches 38 anxiety disorder 38 boredom 38 soreness 38 erectile dysfunction 38 flatulence 38 kidney stones 38 symptoms 38 stage fright 38 snoring 38 runny nose 38 body aches 38 Advil 38 colic 38 migraine 38 heat exhaustion 37 curvature 37 tendonitis 37 tinnitus 37 sinus infection 37 mood swings 37 depression 37 hot flashes 37 carpal tunnel syndrome 37 excruciating pain 37 ibuprofen 37 allergy 37 chest pains 37 acne 37 stiffness 37 sleepiness 36 postpartum depression 36 sleep deprivation 36 eczema 36 sprains 36 irritability 36 hypothermia 36 phobia 36 angina 36 sexual dysfunction 36 exertion 36 difficulty breathing 36 blood sugar