The symptoms of blockage in the left ear may be related to physical factors, secretory otitis media and sudden deafness, as follows: 1. Physical factors: It may be caused by water entering the ear when washing hair or bathing, or by the presence of large cerumen masses blocking the deep part of the ear canal. 2. Secretory otitis media Some patients may develop secretory otitis media, which is caused by inflammatory factors that lead to the dysfunction of the eustachian tube, and may lead to symptoms such as tympanic membrane invagination and middle ear effusion. Sudden deafness can occur, and along with the symptoms of sensorineural hearing loss, there will also be a feeling of blocked ears.