What should you know about delayed travel sickness?

Motion sickness occurs when signals from the inner ear, eyes, and body do not agree during movement. Nausea, dizziness, sweating, headache, and vomiting commonly improve after the motion ends. Symptoms that last well beyond the journey may instead reflect a stomach infection, food-related illness, medication effect, migraine, or another travel-related problem. The destination, food and water exposures, recent medicines, and whether anyone travelling with you is ill can help a clinician work out the cause. Do not assume every post-travel stomach symptom is motion sickness.

Rest somewhere cool and reduce strong smells or screen movement. Take frequent small sips of water or an oral rehydration drink; if vomiting is active, pause briefly and restart with small amounts. When you can eat, choose light foods and avoid alcohol until you feel better. Keep a note of your last journey, symptom onset, food and drink exposures, medicines, urine output, and temperature if available. A travel health clinician can advise on prevention and on symptoms that follow a particular destination.

Seek urgent care for severe or worsening abdominal pain, blood or green material in vomit, fainting, confusion, a stiff neck, severe headache, or inability to keep fluids down. Get medical advice for signs of dehydration such as very little urine, marked dizziness, unusual sleepiness, or a dry mouth, and for fever after travel. People who are pregnant, very young, older, or living with significant medical conditions may need advice sooner. Persistent symptoms should be assessed rather than treated as motion sickness indefinitely.

Could this be motion sickness or another travel-related illness? How can I replace fluids safely? Which medicines are suitable with my health conditions? Should I have testing because of where I travelled?