Airsickness, also known as motion sickness or travel sickness, is a feeling of nausea caused by the motion of a plane, boat, car, or any vehicle in motion or a lack of visual reference points. Symptoms may include dizziness, headache, sweating, and vomiting. There are some synonyms for the word airsickness that can be used interchangeably. These include motion sickness, car sickness, sea sickness, travel sickness, and nausea, among others. Although the severity of the condition may vary from person to person, these synonyms refer to the same uncomfortable experience that many people may have to endure while traveling.