Eustachian tube dysfunction (ETD) involves the inner ear and causes what feels like a fullness or a dullness inside the ear. The eustachian tube is the narrow tube that connects the ear to the back of the nose. The tube is a vital part of your sinuses, and problems arise when a build-up of mucus develops in the tube. Causes and symptoms of eustachian tube dysfunction are varied.
Colds are, by far, the most common cause of eustachian tube dysfunction. Thick mucus develops during upper respiratory tract infections and can block the tube. This is why, when you have a runny nose, doctors recommend avoiding sniffing in. A blocked nose and thick mucus can also cause the tube to swell. When a cold affects your ability to hear, it's because the mucus is blocking the eustachian tube. These symptoms can last longer than the rest of the infection, so it's common to have hearing trouble in the weeks after a cold. Rarely, the fullness in your ear can last for a few months, but even this does not necessarily imply a more serious condition.
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