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🩺 Medically reviewed by the Health Decoded Guide Editorial Team · Last reviewed: July 2026
🔎 Quick Summary
Bell's palsy is a condition that causes sudden weakness or paralysis of the muscles on one side of the face.
It is thought to result from inflammation of the facial nerve and often improves over weeks to months.
Because Bell's palsy can resemble a stroke, anyone with sudden facial weakness should seek immediate medical assessment.
1️⃣ What is Bell's palsy?
Bell's palsy is a condition that causes sudden weakness or paralysis of the muscles on one side of the face.
It occurs when the facial nerve (cranial nerve VII), which controls facial movement, becomes inflamed or compressed.
The condition usually affects only one side of the face and often develops over several hours.
Although Bell's palsy can look frightening, many people recover completely with appropriate treatment.
👉 Sudden facial weakness should always be assessed urgently because stroke can cause similar symptoms.
2️⃣ What causes Bell's palsy?
The exact cause is not always known.
Experts believe Bell's palsy is often triggered by inflammation affecting the facial nerve, possibly following a viral infection.
Viruses that have been associated with Bell's palsy include:
• herpes simplex virus (HSV)
• varicella-zoster virus
• Epstein-Barr virus
• influenza and other viral illnesses
As the nerve swells, it becomes compressed within the narrow facial canal, preventing it from working normally.
👉 Bell's palsy is not contagious, and most people are not able to identify a specific trigger.
3️⃣ Common symptoms
Symptoms usually appear suddenly and affect one side of the face.
Common symptoms include:
• facial drooping
• inability to smile normally
• difficulty closing one eye
• drooping of the mouth
• reduced forehead movement
• excessive tearing or dry eye
• drooling
• altered sense of taste
• increased sensitivity to sound in one ear
👉 Unlike a stroke, Bell's palsy usually affects the forehead as well as the lower part of the face.
4️⃣ Why do these symptoms happen?
The facial nerve controls many important functions, including:
• facial expressions
• blinking
• tear production
• part of the sense of taste
• some hearing functions
When the nerve becomes inflamed, these functions may temporarily stop working properly.
👉 The muscles themselves are usually healthy—the problem lies in the nerve supplying them.
5️⃣ Who is at higher risk?
Bell's palsy can affect anyone, but it is slightly more common in people who have:
• diabetes
• pregnancy (especially during the third trimester or shortly after delivery)
• recent viral infections
• weakened immune systems
Most cases occur between the ages of 15 and 60 years.
👉 Most people develop Bell's palsy only once, although recurrence is possible.
6️⃣ 🩺 When should you seek emergency care? 🚨
Seek immediate medical attention if facial weakness develops suddenly.
This is important because stroke must be ruled out first.
Call emergency services immediately if facial weakness occurs together with:
• arm or leg weakness
• difficulty speaking
• confusion
• loss of balance
• vision changes
• severe headache
👉 These symptoms may indicate:
• stroke
• bleeding in the brain
• another neurological emergency
👉 Never assume sudden facial drooping is Bell's palsy without medical assessment.
7️⃣ Treatment
Treatment depends on the severity of symptoms.
Doctors may recommend:
• corticosteroid tablets (most effective when started within 72 hours)
• antiviral medication in selected cases
• artificial tears or lubricating eye ointment
• eye patch or taping the eyelid closed during sleep if the eye cannot close completely
Some people may also benefit from facial exercises during recovery.
👉 Protecting the affected eye is an important part of treatment because reduced blinking can damage the surface of the eye.
8️⃣ Recovery
Most people begin to improve within a few weeks.
Many recover completely within three to six months.
Recovery may take longer in some individuals, particularly if nerve damage is more severe.
A small number of people may have some long-term facial weakness or muscle tightness.
👉 Early treatment with corticosteroids improves the chance of full recovery.
🟢 Important message
Bell's palsy often improves with time, and many people recover fully.
However, because it can closely resemble a stroke, sudden facial weakness should always be treated as a medical emergency until a healthcare professional confirms the diagnosis.
👉 If you notice sudden facial drooping, seek urgent medical assessment immediately.
FAQ
Is Bell's palsy a stroke?
No. Bell's palsy affects the facial nerve, while a stroke affects the brain. However, they can look similar at first, so urgent medical assessment is essential.
Can Bell's palsy go away on its own?
Yes. Many people recover completely, although treatment with corticosteroids improves recovery when started early.
Is Bell's palsy permanent?
Most people recover fully, but some may have mild long-term facial weakness or muscle tightness.
Can Bell's palsy affect both sides of the face?
It usually affects only one side of the face. Bilateral Bell's palsy is rare and may suggest another underlying condition.
Can Bell's palsy happen more than once?
Yes, although recurrence is uncommon.
🔗 Related Health Topics
• Stroke vs Bell's Palsy
• Stroke
• High Blood Pressure
• Headache
• Dizziness
• Emergency First Aid
📚 Medical References
• National Institute of Neurological Disorders and Stroke (NINDS). Bell's Palsy Information: https://www.ninds.nih.gov/health-information/disorders/bells-palsy
• National Health Service (NHS). Bell's palsy: https://www.nhs.uk/conditions/bells-palsy/
• Mayo Clinic. Bell's palsy – Symptoms and causes: https://www.mayoclinic.org/diseases-conditions/bells-palsy/symptoms-causes/syc-20370028
• American Academy of Otolaryngology–Head and Neck Surgery (AAO-HNS). Clinical Practice Guideline: Bell's Palsy: https://www.entnet.org/quality-practice/quality-products/clinical-practice-guidelines/bells-palsy/
• National Institute for Health and Care Excellence (NICE). Facial weakness and Bell's palsy (Clinical Knowledge Summaries): https://cks.nice.org.uk/topics/bells-palsy/
⚠️ Medical Disclaimer
This article is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
If you have symptoms or concerns, please consult a qualified healthcare professional.
If you develop sudden facial weakness or suspect a stroke, seek emergency medical care immediately.