Nausea (
Latin nausea, from
Greek -
nausia, "ναυτία" -
nautia,
motion sickness", "feeling sick or queasy") is a sensation of unease and discomfort in the upper
stomach with an involuntary urge to
vomit. It occasionally precedes vomiting. A person can suffer nausea without vomiting. (Greek ναῦς -
naus, "ship"; ναυσία started as meaning "
seasickness".) When prolonged, it is a debilitating symptom.