Glue ear is an accumulation of fluid within the middle ear that can lead to hearing loss.
The middle ear is the space where sound is transmitted from the eardrum to the inner ear. The presence of fluid in this cavity impedes the transmission of sound.
The consistency of the fluid is usually thick and viscous, like “snot,” hence the term "glue". The fluid is produced by mucous glands in the middle ear and is essentially similar to the mucus that is produced in the nose.