Ask the doctor: Nothing works for fullness in ears. Any suggestions?
The eustachian tube, which connects the middle ear to the nasal cavity, helps to equalize the air pressure on either side of the eardrum. If your eustachian tube is blocked or not working properly, there's less pressure on the inside of the eardrum than the outside, so the eardrum may cave in slightly, which causes that sensation of fullness. In serious cases, fluid accumulates behind the eardrum because pressure is so low that fluid from surrounding tissues and blood vessels gets pulled into the middle ear.
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