Motion sickness with acid in the mouth is due to the reflux of stomach acid into the throat, resulting in a sour mouth. Motion sickness is actually a form of motion sickness. When a person rides in a car that is too fast in a bumpy, rocking situation, it causes motion sickness, which is mainly manifested as pale, nausea, vertigo, vomiting and other symptoms. When the feeling of nausea and vomiting occurs, it will prompt the stomach acid back into the mouth, thus causing the mouth acidic situation. When there is motion sickness, try to lean on the seat back, keep your head still, if allowed, you can get off the car to a well-ventilated location to rest, if necessary, you can take motion sickness medicine, if the symptoms are delayed or aggravated, to seek medical treatment in a timely manner.