How can they really tell what is acute and what is chronic? Has any of them ever been treated in any way? Also, in my case I first noticed a slight tinnitus already in 1994, but started "suffering for real" in 1999 after a concert. Would that make mine acute all over again? In that case any worsening must be considered acute. I'm also guessing there must be tinnitus that people don't even recognize? That is, it's either not loud enough or at a frequency that we can't hear. If so, then it's impossible to tell whether it is acute or chronic, should it worsen. I hope you understand what I mean.