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Nausea

Nausea is an unpleasant sensation in the stomach or the back of the throat. Nausea can be described as feeling queasy or squeamish, or as an upset stomach. This condition often occurs prior to retching or vomiting (emesis).

Symptoms that may accompany nausea include dizziness and lightheadedness, difficulty swallowing, increased saliva production, rapid heart rate, and changes in skin temperature.

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