I think that depends a great deal. But if it causes you to sleep poorly, I would say it indirectly could affect your tinnitus quite a lot.
I stopped caffeine when my T got worse but didnt really notice all that much difference (ymmv). I drink it during the day but when the night draws in i switch to decaf.
Yes. For some of us. https://www.tinnitustalk.com/threads/caffeine-spikes-tinnitus.10512/#post-631776 https://www.tinnitustalk.com/threads/caffeine-spikes-tinnitus.10512/#post-632123