Why you feel sick in a car, and what to do about it

Motion sickness, an empty stomach, dehydration, too little sleep, heat and chemical fumes can all make people dizzy or nauseous in a car, says Dr Manish Dodmani, a gastroenterologist at KIMS Hospitals, Thane. Fumes from solvents can build up in poorly ventilated cars. Headache, confusion and unusual sleepiness are warning signs; if you feel dizzy, stop the car and get fresh air.