Serous otitis: You probably have fluid build-up behind the ear drum, caused by inflammation of the back of the throat/sinuses keeping your ears from opening up and draining properly - then when negative pressure of swallowing "pulls" on it, your ear "pops" open and releases a little fluid/pressure. If it's gone on for more than a couple weeks, see your doctor to confirm and discuss treatments.
Answered 10/18/2016
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