Eustachian Tube Dysfunction: This condition occurs when the Eustachian tube, which connects the middle ear to the back of the nose and throat, doesn't open or close properly, leading to a feeling of fullness or clogged ears. It's a common issue that can be caused by colds, allergies, or changes in air pressure.

Middle Ear Effusion: Fluid accumulation in the middle ear can cause a feeling of clogged ears. This condition often follows a cold or upper respiratory infection.
Earwax Impaction: Excessive earwax can block the ear canal, leading to a sensation of clogged ears.
Sinusitis: Inflammation of the sinuses can cause Eustachian tube dysfunction, leading to a feeling of clogged ears.
Allergic Rhinitis: Allergies can cause nasal congestion, which can lead to Eustachian tube dysfunction and a feeling of clogged ears.

Acoustic Neuroma: A rare, benign tumor on the nerve connecting the inner ear to the brain. Although unlikely, it's crucial to rule out due to its potential impact on hearing and balance.
Temporal Bone Fracture: A fracture in the temporal bone, which houses the structures of the ear, can cause a feeling of clogged ears and is a medical emergency.
Mastoiditis: An infection of the mastoid bone, located behind the ear, which can spread from the middle ear and requires prompt treatment.

Patulous Eustachian Tube: A rare condition where the Eustachian tube remains open, causing autophony (hearing one's own breathing sounds) and a feeling of clogged ears.
Otosclerosis: A condition characterized by abnormal bone growth in the middle ear, which can cause hearing loss and a feeling of clogged ears.
Cholesteatoma: A type of skin cyst in the middle ear that can cause damage to the surrounding bone and tissue, leading to a feeling of clogged ears.