Nausea is a feeling of discomfort in the stomach that often makes you want to vomit. It can be caused by various factors, such as motion sickness, certain foods, or even stress. When you experience nausea, you might feel queasy or have a churning sensation in your belly. Many people experience nausea at some point in their lives, whether it's from a stomach virus, food poisoning, or during a car ride. While it can be unpleasant, nausea usually goes away on its own. Staying hydrated and resting can help ease the feeling until it passes.