Because the sinuses and ears are neighbors, they share connecting pathways (specifically the Eustachian tube). When the sinuses become inflamed or infected, that inflammation does not always stay contained; it often spreads to the Eustachian tube.
The sinuses and the inner ear are closely linked. The Eustachian tube, which connects the middle ear to the back of the throat, also communicates with the sinuses. When the sinuses become inflamed or infected, it can affect the Eustachian tube and lead to changes in air pressure in the middle ear. does sinus cause dizziness