Most cases of mild age-related tinnitus are associated with high frequency hearing loss. The damage usually comes from chronic exposure to loud sound over a period of years. In some cases exposure to a medication contributes. Caffeine, salt, alcohol, stress, and fatigue can make it temporarily worse, but eliminating these things won't make it go away. There is no cure. In my case, it largely came from using earbuds in an urban environment, back in the days when portable music was in its infancy.
Tinnitus worries...
I have had on and off periodic ringing in the ears for 30 years, (lots of live music) and back in March I decided to invest in a new home audio system, speakers, amp preamp CD player and cables costing about 7k, I have almost constant low level tinnitus now, my doctor says it's a cumulative thing and there is little that can be done. I hardly listen to music beyond normal talking decibels, and am very careful about any other loud DB exposure. Odd how the tinnitus became constant the minute I got my new system set up. I guess this is more of a warning than anything else, so be careful!