1. A feeling of discomfort in the region of the stomach, with aversion to food and a tendency to vomit.
2. Disgust; deep disgust, loathing; used in literature.

Nausea is a symptom of many conditions, including motion sickness, morning sickness during pregnancy, viral infections, and other diseases. It may also be the result of an adverse effect of many drugs.

In medicine, nausea is a particular problem during a few chemotherapy treatments and following general anesthesia. Nausea is also a common symptom of pregnancy.

While short-term nausea and vomiting are generally harmless, there are times when they may indicate a more serious disease. When associated with prolonged vomiting, it may cause dangerous levels of dehydration.

3. Etymology: from Latin nausea, "seasickness"; from Greek nausia, "seasickness, nausea"; from naus, "ship".