This is the most common cause. The Eustachian tube connects the middle ear to the back of the throat and regulates air pressure. When sinuses are congested, the mucous membranes at the opening of the Eustachian tube swell shut.
Your body’s sense of balance is primarily controlled by the , located deep within the inner ear. This system relies on fluid and delicate hair cells to tell your brain which way is "up" and how your head is moving. does sinus cause dizziness