The popping sensation in the ears when swallowing happens because of the Eustachian tube opening. The Eustachian tube is a small passage that connects the middle ear to the back of the throat. When swallowing, muscles engage to open this tube, allowing air to flow into or out of the middle ear, equalizing the pressure between the middle ear and the outside environment. This pressure equalization causes the popping sound or sensation. This mechanism helps keep the pressure on both sides of the eardrum balanced, which is essential for normal hearing and comfort. If the pressures are uneven, the ear can feel blocked or full. The popping is a normal and healthy sign that the Eustachian tube is functioning properly to maintain this pressure balance.

If the Eustachian tube is blocked or not opening properly due to reasons like allergies, colds, sinus infections, or inflammation, the ears might feel uncomfortable or the popping may be more noticeable or painful.