causes ear pain fluid in ear
The Eustachian tube also drains fluid out of the middle ear. When this tube becomes blocked, and air and fluid cannot flow freely, pressure builds in the ear, causing pain. If fluid behind the eardrum becomes infected with a virus or bacteria, it causes a middle ear infection that can lead to pain and fever. Other causes of pain related to the ear include: Injury. Inflammation and infection in the ear canal (the channel between the eardrum and the outside part of the ear).