The eustachian tube equalizes pressure on the eardrum and allows drainage of the middle ear into the throat. The auditory tube can swell and not function properly due to food allergies . Allergies are the most common cause of recurrent ear infections in children. Abnormal function of the tube is the most important cause of ear disease. O titis media is characterised by a feeling of fullness in the ear and stabbing pains which may disturb sleep.
Pressure can even cause the eardrum to rupture.