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From Fellrnr.com, Running tips
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* Much of the research on nausea and vomiting is actually focused on vomiting alone, limiting our understanding of nausea itself.
* It is not possible to detect or to test for nausea. There are various physiological symptoms which may indicate that the subject is the feeling nauseous, but none of these are definitive.
* Nausea is generally accepted to be a protective mechanism. When we ingest toxins nausea frequently follows. The sensation of nausea gives a stronger conditioning to avoid whatever food was consumed just prior to the onset of the nausea. This can cause problems for people undergoing chemotherapy, as they frequently develop many food and versionsaversions.
* Nausea tends to slow the digestive system, probably to reduce the rate of absorption of the toxins.
* After a fast, even as short as an overnight fast, people will sometimes report a mixture of hunger and nausea. Under exceptional circumstances, nausea can be confused with hunger. This may be an adaptive survival mechanism to prevent a ravenous individual from eating indiscriminately of spoiled food and becoming poisoned.
** '''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=
