You probably have narrow Eustachian tubes, like me. I also have a slight case of TMJ. My jaw pops, and so do my ears.
It used to be much worse, when I would get constant ear-aches that ended up draining into my throat and infecting my tonsils, and years of smoking and allergies didn't help either. Now that I've been paleo though, I haven't had a sore throat once, nor have I had any seasonal allergies like I used to.
You have air trapped in your Eustachian tube (from the inside of the ear). I got mine rid off by... boarding a plane to Europe (I was going there for vacations), swimming at sea and letting the water getting in the ear (a few annoying days with the ear being blocked), but ultimately it went away (for the most part) when I switched to paleo.