Why do ears ring or feel clogged sometimes with exercise?

It happens to me too. I think it is some type of blood pressure difference in the inner ear. I was worried about it at first but I haven't found anything in my reaseach to make me think it is a sign of anything bad.

One website says that it is a normal and unavoidable side effect cause by increased blood flow and pressure for some people who exercise and there's nothing that can be done, we just have to live with it.