Opening the Donguibogam library...
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Opening the symptom encyclopedia...

Have you started hearing a buzzing or ringing sound in your ears one day? While others seem fine, do you feel like one ear is muffled and hard to hear from? Have you been casually dismissing it, thinking it is just fatigue or aging? Though rare, did you know these symptoms could be an important signal from your 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.