Motion Sickness Overview What is motion sickness? Motion sickness is a condition that happens when your eyes, inner ear and body send conflicting messages to your brain. You can develop the condition whenever your body is staying still but you’re being moved by a vehicle, like when you’re riding in a car or standing on a boat deck. Some people get a kind of motion sickness while playing video games and virtual reality games (virtual motion sickness or VMS). Symptoms include nausea, breaking out in cold sweat or headache. Fortunately, there are ways to prevent motion sickness or ease its symptoms. Symptoms Motion sickness symptoms can develop slowly or appear all at once. Common symptoms include: Dizziness. Fatigue. Headache. Feeling irritable. Nausea and vomiting. Rapid breathing or feeling like you need to take gulps of air. Salivating more than usual. Sweating, particularly a cold sweat. Causes Motion sickness happens when your brain gets conflicting messages from the parts of your b...