Eustachian tube: Your eustachian tube may be partially blocked leading to a painless/painful pop ; crack when swallowing (similar to sensation when driving up/down mountain or airplane takeoff/landing). It can be aggravated by allergies and/or upper respiratory infections. You may get some relief w/otc antihistamines ; decongestants. If this doesn't help, go see your family doc for possible middle ear infection.
Answered 1/20/2020
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