This month's issue of the magazine 'What Doctors Don't Tell You" page 9 refers to research showing that caffeine has a direct impact on the workings of the inner ear. Evidently doubling consumption to 4 cups a day could reduce tinnitus by 15% regardless of the sufferer's age.
My tinnitus started after stopping coffee and tea due to AF. I have recently restarted some tea and my tinnitus is a bit better but all this could be down to other factors. Due to the risk on restarting AF, I don't think I will be restarting coffee, let alone drinking 4 cups/day any time soon!
Just thought you might be interested.