Sep 15, · Earaches usually occur in children, but they can occur in adults as well. An earache may affect one or both ears, but the majority of the time it’s in one ear. It may be constant or come and go. Since an ear infection is such a common reason for ear pain, let's consider this possibility first. Most ear infections occur inside the ear. Usually there is no sign of infection on the outside. Redness, pain and swelling on the outside of the ear indicate a different type of infection.