Face Drooping on One Side — Bell's Palsy or Stroke?
Waking up with one side of your face not moving is alarming. This is one symptom where the correct diagnosis changes everything — including the urgency of treatment.
One-sided facial drooping is a symptom that always requires prompt medical evaluation. The two most important causes are Bell's Palsy and Stroke — and distinguishing between them on clinical grounds is straightforward for a trained doctor but not obvious to a patient. Both require immediate assessment, but the treatment and urgency are completely different.
Key Points
- Bell's Palsy: the entire face is weak (cannot raise eyebrow). Stroke: forehead is spared (eyebrow can still be raised).
- Starting oral steroids within 72 hours of Bell's Palsy raises complete recovery from 70% to 85–90%.
- Eye protection from day one is critical — inability to close the eye risks corneal damage.
- Ramsay Hunt Syndrome (shingles of the face) causes facial palsy with ear pain and blisters — needs antivirals and steroids.
- Face drooping with arm or leg weakness or slurred speech = stroke emergency — call 108 immediately.
70%
recover fully from Bell's Palsy without treatment
Source: Cochrane / BMJ
85-90%
full recovery with steroids started within 72 hours
Source: NICE CG136
72 hrs
critical steroid treatment window in Bell's Palsy
Source: NICE Guidelines
"The forehead is the key to distinguishing Bell's Palsy from stroke. If the patient cannot raise their eyebrow on the drooping side, all facial muscles are affected — that is a peripheral nerve problem. If the eyebrow can still be raised, the upper face is spared — that pattern points to stroke. That one clinical finding changes everything about the urgency."
Seek Emergency Care Immediately If You Have:
- 1Face drooping with arm or leg weakness on the same side — stroke until proven otherwise
- 2Face drooping with speech difficulty or confusion
- 3FOREHEAD IS NOT AFFECTED (eyebrow CAN raise) — more likely stroke than Bell's Palsy
- 4Gradual onset face weakness over days to weeks (not acute)
- 5Face drooping with severe ear pain and rash in the ear canal
Possible Causes of This Symptom
Bell's Palsy (Facial Nerve Palsy)
Sudden inflammation of the 7th cranial nerve (facial nerve). ALL muscles on one side of the face are affected — including the forehead. Cannot close the eye. Treated with steroids within 72 hours for best recovery.
Stroke
Stroke facial weakness typically SPARES the forehead (because forehead muscles have bilateral brain representation). Associated with arm weakness, leg weakness, or speech difficulty. Emergency evaluation required.
Ramsay Hunt Syndrome
Varicella-zoster virus (shingles) reactivation in the facial nerve. Face drooping with ear pain, blisters in the ear canal, and sometimes hearing loss. Treated with antivirals + steroids.
Parotid Gland Tumour
A tumour in the parotid gland (in front of the ear) can directly infiltrate the facial nerve, causing gradual facial weakness. Requires imaging and ENT evaluation.
Other Causes
Multiple sclerosis, Lyme disease (rare in India), sarcoidosis, and trauma to the facial nerve — less common causes that may be found after Bell's Palsy and stroke are excluded.
How We Diagnose the Cause
Forehead Involvement Assessment
The single most important clinical question: can the patient raise the eyebrow on the drooping side? Yes = likely stroke. No = likely Bell's Palsy (all facial muscles affected).
Urgent CT Brain if Stroke Suspected
Any clinical suspicion of stroke (forehead spared, other neurological features) triggers urgent CT brain imaging.
EMG/NCS for Bell's Palsy Severity
In severe Bell's Palsy or slow recovery, nerve conduction studies assess the degree of nerve damage and predict recovery.
Your Treating Specialist
Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad
In-house EEG and NCS — same-visit diagnosis, no referral delays
Frequently Asked Questions
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