Also known as: Idiopathic Facial Nerve Paralysis (Bell's Palsy)
Bell's palsy is a sudden weakness or paralysis of the muscles on one side of the face, caused by inflammation of the facial nerve (cranial nerve VII). Most cases recover fully.
Bell's palsy affects approximately 20-30 per 100,000 people annually. It is the most common cause of acute facial paralysis, peaking between ages 15-45.
The condition is believed to result from viral reactivation (usually herpes simplex virus) causing inflammation and swelling of the facial nerve within the temporal bone's narrow bony canal.
Critically, Bell's palsy must be distinguished from stroke — Bell's palsy affects the entire half of the face including the forehead, while stroke-related facial weakness spares the forehead.
People with Bell's Palsy often experience the following symptoms.
Sudden onset weakness or complete paralysis affecting one entire side of the face, including forehead wrinkles.
Inability to fully close the eye on the affected side, risking corneal exposure and dryness.
Altered or lost taste sensation on the anterior two-thirds of the tongue on the affected side.
Increased sensitivity to sound on the affected side due to loss of stapedius muscle function.
Certain factors may increase your likelihood of developing Bell's Palsy.
Common approaches to managing bell's palsy. Always consult a healthcare provider for personalized treatment.
Prednisolone started within 72 hours of onset significantly improves recovery outcomes. The most important treatment.
Valacyclovir or acyclovir may be added to steroids for severe cases, though evidence of added benefit is debated.
Artificial tears, ointment, and taping the eye shut at night to prevent corneal damage from incomplete closure.
Facial exercises and neuromuscular retraining to optimise recovery and prevent synkinesis.
Clinical diagnosis based on sudden-onset peripheral facial weakness. MRI if atypical features, no improvement by 3 months, or recurrence. Blood tests for Lyme disease in endemic areas.
Seek immediate care for sudden facial weakness to rule out stroke. See a doctor within 72 hours for optimal treatment. Seek urgent care if you cannot close your eye completely.
Steps that may help reduce the risk of developing or worsening bell's palsy.
No proven prevention
Prompt treatment optimises recovery
Protect exposed eye during illness
Manage diabetes and other risk factors
If left untreated or poorly managed, bell's palsy may lead to:
Most patients begin recovering within 2-3 weeks. Full recovery occurs in 70-85% within 3-6 months.
No. Bell's palsy affects the entire face half including forehead. Stroke spares the forehead. Both need urgent evaluation.
Recurrence rate is approximately 7-12%. Recurrence should prompt investigation for underlying causes.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.