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Sudden hearing loss usually affects one ear and can develop within three days or less.
The condition should not be ignored, with guidance advising people to see a doctor or hearing specialist as soon as possible.
Patients should tell their doctor when the hearing loss started and mention symptoms such as ringing in the ear or dizziness.
Recommended treatment should be followed, including taking prescribed medicines as directed.
Possible causes include viral or bacterial infections, certain medications, head injuries, damage to the inner ear and damage to the nerve carrying sound from the ear to the brain.
