It's only started since I've been pregnant. After googling, I found out it's common during pregnancy and it is called Pulsatile Tinnitus. It's a constant heartbeat in my left ear. It almost sounds like I have fluid in my ear, or pressure is built up, but there is no pain. Nothing is making it go away besides laying on my right side. I've tried popping my ear, which stops it for about 10 seconds. I've read that it only goes away after delivery, and it can be related to high blood pressure, iron deficiency, along with other things. Has anyone else had this? I'm about ready to stab a screwdriver in my ear it's so annoying.