Typical case Female, 13 years old. Sudden bilateral deafness for 5 days. The patient had a sudden onset of bilateral deafness with dizziness, headache and weakness of limbs during running in gym class 5 days ago. She was diagnosed with “sudden deafness” and given fluids (medication unknown), which did not work. Due to deafness and weakness of the limbs without improvement, he came to our Kotter Needs Outpatient Clinic on the morning of April 23, 2015. Clinical examination: the patient was sitting in a wheelchair, depressed, the tympanic membrane of both ears was intact and clearly marked, the tuning fork test showed the disappearance of bilateral auricular air bone conduction, pure tone audiometry showed extremely severe deafness in both ears, auditory brainstem response test showed normal wave I-V latency in both ears; otoacoustic emission showed approximately normal DPOAE, acoustic conduction resistance test showed type A tympanic curve in both ears and stapedius muscle reflex threshold of 70-80 dB. analysis of test results confirmed the diagnosis of The diagnosis of bilateral functional deafness was confirmed. After 20 minutes, the patient’s hearing was completely normalized in both ears, and the pure-tone audiometry was immediately repeated. Meanwhile, the patient was able to leave the wheelchair.