What should you know about motion sickness nausea?

Your inner ears sense acceleration and balance, while your eyes report what you are looking at. A car passenger reading, a traveller below deck or someone watching a screen may receive messages that do not line up. The brain responds with nausea and may also produce pallor, sweating, excess saliva, dizziness or vomiting. Anxiety can intensify the sensation, but the physical mismatch is the central trigger.

Symptoms often begin during movement and may settle after the journey. Nausea that starts without movement, persists after recovery or returns frequently deserves a separate assessment because infections, medicines, migraine and digestive problems can also cause it.

Look at the horizon or a distant fixed object, keep your head supported and choose a position with less rocking. Fresh air may help. Stop reading and put away screens. Sip water regularly, and choose small bland snacks instead of a heavy meal. Avoid strong smells and alcohol around the journey.

If you have had motion sickness before, discuss preventive medicine with a pharmacist or clinician before departure. It may work best when planned early, and some options cause sleepiness or blurred vision. Keep a safe route to fresh air and a container available if vomiting develops.

Seek medical help if vomiting stops you keeping fluids down, you become unusually sleepy or confused, you faint, or you pass very little urine. Urgent assessment is needed for severe abdominal pain, a severe headache, stiff neck, chest pain, breathing difficulty, blood in vomit or new weakness. Arrange a review if nausea occurs repeatedly when you are not travelling.

Tell your clinician which type of travel triggers nausea, how quickly it begins and whether vomiting or dizziness follows. Ask about prevention, suitable medicine, side effects and whether another condition could explain symptoms outside travel. Mention pregnancy, chronic illness and all medicines you take.