A sudden onset of blockage and stuffiness in one ear must be checked in further detail at the hospital, with an endoscopy of the ear, electrical audiometry and acoustic impedance tests done to discover exactly where the lesion is, so that it can be treated appropriately. There are many reasons for unilateral ear stuffiness, mainly including disorders of the outer ear, middle ear and inner ear. Cholesteatoma of the external auditory canal, epidermal plugs of the external auditory canal, boils of the external auditory canal, and polyps of the external auditory canal can clog up and cause ear canal stuffiness and discomfort. Middle ear disorders, such as oozing otitis media, cicatricial otitis media that develops into oozing otitis media, and oozing fluid inside the middle ear cavity in oozing otitis media, can also cause stuffy ears. In children with adenoid hypertrophy, blockage of the Eustachian tube pharyngeal opening can also cause oozing otitis media, which can lead to ear swelling and discomfort. Inner ear disorders, such as Meniere’s disease in the early stages of the disease, can also cause stuffy ears, hearing loss, and vertigo. Sudden deafness, the earliest symptom is also the swelling and discomfort in the ear.