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There are several diseases of the ear; some are sudden onset, others take years to build up.
Generally a sudden hearing loss is an indicative of a fairly serious problem and should be looked into right away. If you realize sudden hearing loss, call your family doctor immediately or go to your nearest emergency room. Time could be an issue with certain disorders, so don’t hesitate to seek help immediately.
In the Blog section you will find an article written about the Sudden Onset hearing Loss syndrome, you can find it here