I have had pulsatile tinnitus since my school has an OFSTED inspection,(I am the Headteacher). M.R.I. scan revealed no abnormalities, and heart specialist pronounced me fit. Blood pressure normal for my age. (134/78)(I am into Yoga, jogging etc.) I live with it; head down on pillow being the most noticeable occurrance, although I can hear it at any time. I believe the medical experts are unsure of what it is and causes. Courage, mes amis! Jonathan.