Hi! I've had a constant, high-pitched hiss in both ears for many years, and it bothered me enough! But 5 years ago, the same sound became pulsing, and it bothers me even more. I've had most tests- MRI, MRV(vein), MRA(artery), doppler of my carotids, and a CT angiogram- all came back negative. The only test that I have not had is the cerebral angiogram, and I have not had it because it can cause a stroke in some people. I've tried Neuromonics but it did not help much except to distract a little from the p.t. The shower and other sounds does mask it. The pulsing sound is in sync with my heartbeat/pulse. Does anyone else have pulsatile tinnitus? If so, have you found out the cause and a good treatment? Thanks, everyone!!