The causes of sudden hearing loss in the left ear mainly include viral infection, blood supply obstruction in the inner ear or blockage of the Eustachian tube, etc., which need to be treated as soon as they are detected.
1. Infections such as mumps virus, cytomegalovirus or herpes virus may cause atrophy of the inner ear spirochete or loss of cochlear neurons, resulting in sudden hearing loss.
2. If thrombus or embolism occurs in the cochlear blood vessels, it may cause blood supply obstruction in the inner ear, which may affect the normal circulation of blood, resulting in ischemia of the inner ear blood vessels or abnormal cellular metabolism, which may increase the permeability of blood vessels and lead to the phenomenon of sudden hearing loss.
3. Increased negative pressure in the middle ear may cause blockage of the eustachian tube, which leads to fluid leakage in the blood vessels to occur secretory otitis media, and may also appear to be suddenly unable to hear the phenomenon.