what causes fluid in the ears?
All cases of fluid in the ear are caused by some form of auditory tube dysfunction which prevents your eustachian tube from adequately draining. Common causes for developing fluid in the ear for both adults and children includes: Allergies. Any kind of congestion, from a cold virus, similar infection, or even pregnancy.
As mentioned, Eustachian Tube Dysfunction (ETD) is often the most common cause of fluid behind eardrum, adults group especially. The Eustachian tube delivers three essential physiological functions within the body, which is the equilibration of pressure between the external and middle ears, secretion and cleansing, and protection of the middle ear.
Upper respiratory allergies and inflammation and swelling of the adenoids, the tissue at the back of the nose, can cause poor fluid drainage from the middle ear to the external ear and therefore cause a blockage in the Eustachian tube. Excess fluid can lead to middle ear congestion.