This article is from the Tinnitus FAQ, by markb@cccd.edu (Mark Bixby) with numerous contributions by others.
One possible cause is Diabetes. Other than that no one that I
have spoken with knows. It may also be hereditary. Usually
doesn't show up until later in life 40 and beyond, and can burn
itself out in 3 - 5 years. Some have it earlier in life (me at
35) and could have it the rest of our lives.
 
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