Eustachian Tube Dysfunction: This condition occurs when the Eustachian tube, which regulates air pressure in the ears, doesn't open or close properly, leading to a feeling of fullness or water in the ears. Morning congestion and changes in air pressure during sleep can exacerbate this condition.

Middle Ear Effusion: Fluid accumulation in the middle ear can cause a sensation of water or fullness in the ears. This condition is often associated with upper respiratory infections or allergies.
Earwax Impaction: Excessive earwax can block the ear canal, leading to a feeling of fullness or water in the ears. Morning earwax buildup or shedding can contribute to this sensation.
Sinus Pressure and Congestion: Sinus infections or allergies can cause Eustachian tube dysfunction and lead to ear fullness or a sensation of water in the ears, especially in the morning.

Acoustic Neuroma: A rare, benign tumor on the nerve connecting the inner ear to the brain. Although unlikely, it's crucial to rule out this condition due to its potential impact on hearing and balance.
Inner Ear Infection (Labyrinthitis): An infection of the inner ear can cause severe vertigo, hearing loss, and a feeling of fullness in the ears. Prompt diagnosis and treatment are essential to prevent long-term damage.
Temporal Bone Fracture: Trauma to the temporal bone can cause fluid leakage into the ear, leading to a sensation of water. This condition requires immediate medical attention.

Meniere's Disease: A disorder of the inner ear that affects balance and hearing, causing vertigo, tinnitus, and ear fullness. While rare, it's essential to consider this condition in patients with persistent and severe symptoms.
Patulous Eustachian Tube: A rare condition where the Eustachian tube remains open, causing autophony (hearing internal sounds) and a sensation of fullness in the ears.
Cholesteatoma: A type of skin cyst in the middle ear that can cause hearing loss, ear fullness, and other complications if left untreated.