An earache, also known as otalgia, is ear pain that can originate from inside or outside the ear. Ear pain can be caused by issues in the external, middle, or inner ear, though the pain feels the same. Common causes of ear pain include ear infections, impacted teeth, sinus issues, throat infections, and migraines. Ear infections are especially common in young children and may develop as a side effect of other contagious illnesses like colds.