Anyone know of blood flow or cardiac problems which cause tinnitus? For nearly a year I have had constant ringing/hissing in both ears but occassionaly get pulses and vibrations in my left ear in sync with my heartbeat. I also have a constant painless throbbing in my forehead and back of head that is also in sync with my heartbeat. I have had an MRI of brain/ears, blood tests, an examination by an ENT doctor and no problems were found. Blood pressure is also normal I am 30 years and have no other health problems.