Bell's palsy can cause tinnitus and, more often, sound sensitivity, because the inflamed facial nerve also controls the stapedius, a middle-ear muscle that damps loud sounds; both usually improve as facial movement returns. It is also a useful comparison with Ramsay Hunt syndrome, a more serious condition with a very similar presentation.
What Bell's palsy is
Bell's palsy is a sudden, temporary weakness or paralysis of the muscles on one side of the face, caused by inflammation and swelling of the facial nerve (the seventh cranial nerve). Cleveland Clinic lists tinnitus and hyperacusis (sensitivity to sound) directly among its recognized symptoms, alongside the more commonly known facial drooping, loss of taste, and pain around the ear. Symptoms typically develop quickly, often over about 48 hours.
The specific mechanism behind the auditory symptoms
Part of this connection is mechanistically clear-cut. The facial nerve controls a small middle-ear muscle called the stapedius, whose job is to reflexively dampen the transmission of loud sounds — it's part of the ear's natural volume-limiting system. When the facial nerve is inflamed and weakened in Bell's palsy, the stapedius muscle loses its normal function, and sounds that would ordinarily be dampened pass through the middle ear at greater intensity. This is the direct, well-established explanation for hyperacusis in Bell's palsy, and it's considered the more common and more clearly explained of the two auditory symptoms. Tinnitus is thought to occur secondarily — either through irritation of the nearby auditory nerve from the same inflammation affecting the facial nerve, or through the altered middle ear mechanics the stapedius dysfunction creates — and is described as a less consistently observed, though still recognized, associated symptom.
How this compares to Ramsay Hunt syndrome
Both conditions involve facial nerve dysfunction and share a similar presentation — facial weakness, ear pain, and auditory symptoms — which is exactly why they're sometimes confused early on. The key distinguishing feature is the rash: Ramsay Hunt syndrome involves a visible, painful vesicular rash caused by active viral reactivation, while Bell's palsy has no identified rash and — despite ongoing research into a possible viral link — is officially considered to have no fully identified single cause. Ramsay Hunt syndrome also tends to involve the auditory symptoms more directly and severely, since it can affect the nearby hearing nerve as well as the facial nerve, whereas Bell's palsy's auditory symptoms come specifically through the indirect stapedius-muscle pathway described above.
The good news: recovery is generally favorable
Unlike Ramsay Hunt syndrome, where treatment timing directly affects long-term outcomes, Bell's palsy generally has a favorable prognosis on its own. Since hyperacusis in Bell's palsy is directly caused by temporary stapedius muscle paralysis, most sources note that it resolves as facial nerve function returns — commonly within a few weeks, with most people reaching complete or near-complete recovery within a few months.
A prospective study of 269 people with Bell's palsy, all enrolled within 48 hours of onset, found that by day 10, 10.2% had already fully recovered while 39.9% still had severe paresis. Aural fullness and hyperacusis were among the less commonly reported accompanying symptoms, and the pattern of accompanying symptoms gave clinicians useful early information: dry mouth at onset, for example, went with more severe palsy and a poorer early recovery.
What the treatment evidence shows
A 2016 Cochrane review pooled seven randomised trials with 895 participants. Six months or more after treatment began, 17% of people given corticosteroids still had incomplete recovery of facial movement, against 28% in the control groups — roughly one incomplete recovery avoided for every 10 people treated. Corticosteroids also reduced synkinesis, the involuntary linked facial movements that can follow nerve recovery, and in the trials that reported side effects, adverse effect rates did not differ significantly from placebo.
The 2013 clinical practice guideline from the American Academy of Otolaryngology–Head and Neck Surgery Foundation turns that into timing. It recommends that clinicians first exclude identifiable causes of facial weakness through history and examination, prescribe oral steroids within 72 hours of symptom onset for people aged 16 and over, and protect the eye when it cannot close fully. It advises reassessment or referral for new or worsening neurological findings at any point, eye symptoms at any point, or incomplete facial recovery 3 months after onset.
Both sources measure facial recovery, not ear symptoms. There is no direct evidence here that steroids speed the tinnitus or sound sensitivity specifically; those are expected to improve as the facial nerve does.
What to do
Bell's palsy still warrants a prompt medical evaluation despite its generally good prognosis — partly to rule out other causes of facial weakness (including stroke, which requires urgent, different treatment), and partly because early treatment with corticosteroids has evidence supporting faster, more complete recovery. If tinnitus or sound sensitivity are part of your presentation, mentioning them specifically helps build a complete clinical picture, even though they're expected to improve as the facial paralysis itself resolves. In the large majority of cases, the auditory symptoms are a temporary feature of a condition that resolves on its own.