The Eustachian tube is responsible for balancing the pressure between the middle ear and the outside, and also helps prevent bacteria from flowing back from the throat to the middle ear. It can be seen that the Eustachian tube is an extremely important part of the ear. When the Eustachian tube is dysfunctional and inflamed, it will cause discomfort as well as affect the patient's hearing ability.

Ear pain when flying is also known as ear barotrauma, which occurs when your eardrum is stressed due to an imbalance in the air pressure in the environment and the air pressure in the middle ear. Therefore, when sitting on a plane, you often experience pain and earache.