I developed constant tinnitus a couple of years ago, probably from a sequence of causes:

I've had sinus problems since childhood. Some exposure to loud music. An upper back spine injury that affects my neck and chest muscles. With this I sometimes had tinnitus, usually worse in the evenings or after spending many hours in front of a screen.

Then I got knocked on the head twice, the second time left a small dent in my nose, and it damaged the right side of my jaw. After this the tinnitus became more permanent.

Almost worse than the tinnitus is that my ears are always popping, as in many times per day. Just sitting at my desk I'll get the same sensation you get on descent when scuba diving, and I have to pinch my nose and blow on it to equalize. Any else have this symptom?