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HighlightsNausea has been defined as an "unpleasant painless subjective feeling that one will imminently vomit". While nausea and vomiting are often thought to exist on a temporal continuum, this is not always the case. There are situations when severe nausea may be present without emesis and less frequently, when emesis may be present without preceding nausea. The underlying mechanisms involved in nausea are complex and encompass psychological states, the central nervous system, autonomicdoi:10.17987/icfj.v13i0.492 fatcat:rk7kvvgk7va23hixecqiy3pruq