My T started so gradually that I don't know when it started. The sound I hear is the same as I heard at night as a child sleeping with my head next to the open window in summer. Crickets lots of crickets. For that I am glad became I know that it could be a shrill whistle or other annoying sounds. I'm here to learn how to cope as it getts louder. I have not had a hearing test yet. I am 63 .