Nausea and vomiting during travel are commonly caused by motion sickness, which happens when the brain receives conflicting signals from the eyes and inner ear during movement. Symptoms may include dizziness, sweating, headache, nausea, stomach discomfort, and vomiting, especially during long car, bus, boat, or aeroplane journeys. Medicines such as dimenhydrinate, meclizine, or other anti-motion sickness tablets are commonly used before travel to help reduce nausea and vomiting, but the right medicine depends on your age, medical history, pregnancy status, and other medicines you may already be taking. Some of these medicines can cause sleepiness, dry mouth, or dizziness, so they should be used carefully. Sitting near a window, looking straight ahead, avoiding heavy oily meals before travel, staying hydrated, and getting fresh air may also help reduce motion sickness naturally. Reading on mobile phones or books during travel may worsen symptoms in some people. Avoid taking multiple anti-vomiting medicines together without medical advice. Consult a doctor if vomiting becomes severe, happens even without travel, or is associated with severe headache, ear problems, fever, or persistent dizziness.