When sitting on high speed train, it is difficult to sit on the ear, which may be caused by the Eustachian tube dysfunction due to the drastic fluctuation of air pressure, and it can be improved by chewing, swallowing and other actions. High-speed rail running speed is faster, in the process of train running, it will form a large air pressure fluctuation with the outside world, for the air pressure sensitive people, it is easy to lead to their Eustachian tube ventilation obstacle, which makes the discomfort in the ear belongs to the normal physiological phenomenon, and generally do not need to carry out special treatment. At this time, you can chew, swallow or pinch the nose to puff, etc., so that the Eustachian tube ventilation, and then regulate the outside air pressure and the middle ear air pressure changes in the difference, to alleviate due to the sharp fluctuations in air pressure difference caused by the ear discomfort. If the patient’s discomfort worsens after traveling in a car, consult a doctor in time and take corresponding treatment according to the doctor’s advice.