Hi, I'm 28 years old and 'suffer' from pulsatile tinnitus for at least 5 years now. Probably had it longer, but can't really remember it. Went to the doctor for it a couple of times, but they are thinking that it's just a 'harmless' version of pulsatile tinnitus, so I should just live with it. Lately I sense that the pitch has become slightly lower and the volume slightly higher. It was a pretty high pitched humming sound and it is still, but just became a bit lower pitched and more audible. So what exactly is responsible for the pitch of this kind of tinnitus? Does it mean the blood is rushing through my veins faster? Or slower? And what could cause that? Any opinions about this?