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nausea
(naw´ze-ә)
an unpleasant sensation vaguely referred to the epigastrium and abdomen, with a tendency to vomit. This may be a symptom of a variety of disorders, some minor and some more serious. It is usually felt when nerve endings
in the stomach and other parts of the body are irritated. The irritated nerves send messages to the center in the brain that
controls the vomiting reflex. When the nerve irritation becomes intense, vomiting results.

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