I have no idea what the causes of most of these pains are, they're very mild, and they tend to go away on their own once I stop paying attention to them.

I do seem to have frequent trouble with pain behind my ears that probably comes from my eyeglasses, though. Having my eyeglasses adjusted doesn't seem to help very much, and I can't focus more than six inches away from my face without them, so I just live with it and take over-the-counter painkillers when it gets bad.