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** '''Delayed nausea'''. This is where the patient is initially free from nausea, but 18-24 hours after the treatment nausea begins.
* '''Motion sickness'''. It is believed that everyone who possesses a working inner either can be made nauseous through a suitably provocative motion. However there are wide individual variations in the level of motion needed to provoke nausea.
** '''Inner ear disturbances'''. Problems in the inner ear can lead to motion sickness that can in turn lead to nausea.
* '''Space travel'''. Microgravity tends to exacerbate motion sickness, and different space programs reported that 35-66% of astronauts suffer from Space Motion Sickness (SMS). Note that the Mercury and Gemini missions had no SMS, probably because the small capsules restricted motion.
* '''Heat Illness'''. Nausea is a symptom of heat exhaustion (Core temperature over 38°C/100.4°F).
=Taste Aversion=