Tinnitus is the cause of a humming sound in the ear. There are several things that can cause tinnitus; ear infections, wax in the ear, hearing loss from loud noises, and Meniere's disease.
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The cause can be a too high sound pressure level. Scroll down to related links and look at "Decibel Table - Comparison Chart".
tinnitus, a symptom, say you are exposed to a long period of loud noises, and then it's silent, you hear the ringing noise, you are most likely experiencing tinnitus.