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Bell's Palsy

Idiopathic Acute Peripheral Facial Paralysis with Excellent Spontaneous Recovery in Most Cases

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is Bell's Palsy?

Bell's palsy is the most common cause of acute peripheral facial paralysis, accounting for 60–75% of all unilateral facial paralysis cases; annual incidence approximately 15–30 per 100,000.

Idiopathic disorder with strong evidence for viral etiology, particularly herpes simplex virus type 1 (HSV-1) reactivation in the geniculate ganglion; varicella-zoster virus and other viruses also implicated.

Pathophysiology: viral or inflammatory edema of the facial nerve within the bony fallopian canal, leading to compression, ischemia, and demyelination/axonal damage of the affected nerve segments.

Distinct from central facial palsy (stroke, tumor) which spares forehead and brow due to bilateral cortical innervation of upper face.

Symptoms

Sudden onset unilateral facial weakness or paralysis (peak intensity within 24–72 hours)
Inability to close eye on affected side (lagophthalmos), with risk of corneal exposure and dryness
Drooping of eyebrow, mouth corner, and nasolabial fold on affected side
Difficulty smiling, frowning, blowing, whistling, retaining saliva on affected side
Loss of taste on anterior two-thirds of tongue (chorda tympani involvement) on affected side
Hyperacusis (sensitivity to sound) due to stapedius muscle paralysis
Posterior auricular pain or numbness preceding or accompanying paralysis (50%)
Decreased tearing on affected side, occasional hyperacusis
All branches of facial nerve affected (unlike central palsy which spares forehead)

Risk Factors

All ages affected; peak incidence 30–45 years
Equal male-to-female distribution
Pregnancy (especially third trimester and immediate postpartum, 3–4× increased risk)
Diabetes mellitus (5× increased risk, often more severe and slower recovery)
Hypertension and obesity
Recent viral illness, upper respiratory tract infection
Family history of Bell's palsy (genetic component, 4–14%)
Cold weather and stress (anecdotal triggers)
Differential considerations: stroke, brain tumor, Lyme disease, Ramsay Hunt syndrome (varicella zoster), Guillain-Barré syndrome, sarcoidosis, parotid tumor, otitis media

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Sudden facial weakness or paralysis (within hours to days) — urgent evaluation to rule out stroke
  • Bilateral facial weakness, slowly progressive paralysis, or recurrent episodes (atypical for Bell's palsy)
  • Associated symptoms: vesicular rash on ear/face (Ramsay Hunt syndrome), tinnitus, vertigo, hearing loss
  • History of recent tick exposure or travel to Lyme-endemic area
  • Persistent paralysis or no improvement after 3 months
  • Eye complications: corneal abrasion, ulceration, severe dry eye

Treatment Methods

01
Diagnostic evaluation: detailed neurological examination, House-Brackmann grading scale (I–VI for severity), assessment of all facial nerve branches, hearing evaluation
02
Differential diagnosis: rule out central palsy (stroke), Ramsay Hunt syndrome (vesicular rash on ear), Lyme disease (tick exposure, erythema migrans), tumor (slow onset, multiple cranial neuropathies)
03
Imaging: not routinely required for typical Bell's palsy; MRI brain with gadolinium for atypical features (slow onset, recurrent, bilateral, multiple cranial nerve involvement, suspected mass), or in patients with no improvement at 3 months
04
Electrodiagnostic studies (EMG/NCS): generally not indicated in early phase; useful at 2–3 weeks for prognostic information in severe cases (>90% nerve degeneration suggests poor recovery)
05
Laboratory testing: blood glucose, HbA1c, Lyme serology (in endemic areas), HIV testing, ESR/CRP if vasculitis suspected, cerebrospinal fluid analysis if infection suspected
06
Corticosteroid therapy (mainstay): prednisolone 60–80 mg daily for 5 days followed by taper over 5 days, total 10-day course; initiate within 72 hours of onset for best efficacy
07
Antiviral therapy (controversial): valacyclovir 1000 mg three times daily or acyclovir for 7 days; combined with corticosteroids may improve outcomes in severe cases (House-Brackmann V-VI)
08
Eye protection (essential): artificial tears every 1–2 hours during day, lubricant ointment at night, eye patch or moisture chamber for nighttime, sunglasses outdoors; gold weight implant or tarsorrhaphy for severe lagophthalmos
09
Physical therapy: facial exercises (mirror biofeedback) to maintain muscle tone, gentle massage; controversial benefit but generally encouraged
10
Acute pain management: NSAIDs, acetaminophen for posterior auricular pain
11
Ramsay Hunt syndrome (varicella zoster facial palsy): higher-dose antiviral therapy (acyclovir 800 mg five times daily or valacyclovir 1000 mg three times daily) plus corticosteroids for 7–10 days; worse prognosis than Bell's palsy
12
Recovery prognosis: 70–90% complete recovery, 5–10% partial recovery with residual weakness or synkinesis (involuntary movements), 5% no recovery; recovery typically begins within 3 weeks with full recovery by 3–6 months
13
Complications: corneal exposure keratopathy, ulceration; synkinesis (cross-wiring during regeneration), facial contracture, crocodile tears (gustatory tearing), facial pain
14
Surgical decompression: controversial, considered only in severe cases (House-Brackmann VI) within 14 days of onset and with electrophysiologic evidence of >90% degeneration; not standard of care
15
Long-term management: facial rehabilitation therapy for synkinesis, botulinum toxin for hyperkinetic synkinesis or contralateral hyperactivity, plastic surgery for static asymmetry
16
Follow-up: weekly assessment in first month, monthly for 3 months, then as needed; counsel on complete recovery time course (3–6 months) and management of residual symptoms

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.