What can it mean if my ear keeps constantly popping?

It might be a case of TMJ which is not really something to be scared about. TMJ is just a misalignment of you're wisdom teeth and can cause your ear to pop a lot and also cause you to yawn really frequently, have headaches, and your jaw to pop as well. I'm not sure if you have all those other symptoms as well. I have TMJ and this happens pretty frequently to me as well only instead of a popping sound it's more like a squeak or whisper sound lol.