I have it too - not sure what causes it - have had it for decades - sometimes I wonder if other people can hear it coming out of me ears!

Tinnitus may be the result of your brain creating the sensation of high-pitched sound when you lose the ability to hear those frequencies. I'm not aware of any treatment for it other than cognitive therapy to help you ignore it. At night, I use a mechanical white noise generator. Some people prefer apps that can generate sounds like wind rushing through trees, ocean waves breaking, thunderstorms, etc.

One thing you can do yourself to improve the condition is to buy a GOOD ear wax removal kit. Ear wax contributes to the condition.

Also, eat lots of fresh pineapple. It contains bromelain, an enzyme with anti-inflammatory properties, which may help to alleviate tinnitus.

There's actually a dietary pill that you can take I don't remember the name of it but it helped me.

Several things can cause that. Being subjected to loud noises is probably the most common. But long term, high doses of aspirin can also cause tinitis. Perhaps your doctor can find the cause and recommend a treatment.i

See a chiropractor