It's really any noise you hear in your ear that isn't coming from an external source.
36+ Ringing In Ears
Background. Most often, it is caused by damage to or the loss of sensory hair cells in the cochlea, or the inner ear. Ringing in your ears, or tinnitus, starts in your inner ear.
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Ringing in the ears (tinnitus) is noise originating in the ear rather than in the environment. How to know if the ringing in your ears is tinnitus. If so, how serious is it, what causes it, and how to treat it and other hearing problems.
Ringing in the ears is noises or sounds in the ears or in the head that do not come from any external source.
Ringing in the ears (tinnitus) is noise originating in the ear rather than in the environment. The ringing could also be a hissing. Left ear ringing is associated with messages about your life on earth. Abruptly, with no warning or apparent cause, one or both of your ears starts to ring.