I suffer from pretty strong tinnitus.

I have also had episodes of extreme eye dryness. Furthermore, I got floaters whose onset matches my tinnitus onset. Additionally I have very mild sporadic joint pain. I'm HLA-B27+.

Altogether, this is quite obvious evidence for autoimmune arthritis or some related autoimmunity. I know this because I do autoimmune genetics research in a top lab. I've gone to a few doctors and they never even suggested the possibility of me suffering from autoimmune disease, which is scary.

I'm in the process of being diagnosed only because I explicitly decided to go to a rheumatologist myself. The rheumatologist facepalmed when he heard the whole story.

I suspect a significant proportion of tinnitus phenotypes are mild autoimmune ones.