Sudden Deafness on One Ear
Idiopathic Sudden Sensorineural Hearing Loss (SSHL)
Sudden deafness, most frequently experienced in one ear without any apparent cause, is called idiopathic sudden sensorineural hearing loss (SSHL) by doctors.
Degree of hearing loss does vary, although often the condition progresses to a complete loss of hearing in the given ear within 72h.
Normally a significant loss of hearing is required for any person to notice this and if you do notice it, time is of the essence: see a doctor as soon as possible, whether they be your GP, local A&E or your local / private Ear-Nose-Throat (ENT) specialist.