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Opening the symptom encyclopedia...

Have you noticed a ringing sound in your ears lately, or felt frustrated because someone seemed to be speaking but you could not quite understand them? That uncomfortable feeling of aural fullness, as if your ears are completely blocked, often worsens when you are under stress. This may actually be an important warning signal sent by fire inside the body.

How startling would it be if you woke up one morning and one ear suddenly felt muffled and could not hear properly? As if submerged under water, sounds hum and echo, accompanied by a ringing sound in the ear. This describes sudden sensorineural hearing loss, which can arrive without warning.