Nausea is a general feeling of unease and discomfort in the stomach, often with the urge to vomit. The word nausea comes from the Latin word for seasickness.^[1]

Nausea is a symptom, rather than an illness or disease. The causes for it very often are not in the stomach itself, but somewhere else in the body. Nausea is often caused by a stomach virus. Nausea is usually harmless, in the short term. A good treatment for it can be not to take solid food (and to only drink non-alcoholic drinks, like water). Nausea can also occur during pregnancy, and is quite normal in that context. People can suffer nausea without vomiting.

This short article about biology can be made longer. You can help Wikipedia by adding to it.