Quick Answer
Hemifacial spasm causes progressive facial twitching on one side — often from blood vessel compressing the facial nerve. Highly treatable.
Medically reviewed by Dr. Jitendra Prasad Yadav • NMC 8029 • Kathmandu Neurology Clinic & Cognitive Center
Hemifacial spasm is a neurological disorder causing involuntary, irregular twitching or spasm of the muscles on one side of the face — typically starting around the eye and progressing to involve the cheek, mouth and neck. It's caused by compression of the facial nerve (cranial nerve VII) — most commonly by a blood vessel loop.
Symptoms
Starts as intermittent twitching of the eyelid, progresses to involve cheek, mouth and neck muscles on one side. Spasms may be triggered by stress, fatigue or facial movement. Unlike Bell's palsy (which is weakness), hemifacial spasm is excessive movement.
Cause
Vascular compression of the facial nerve at its exit from the brainstem — most commonly by the anterior inferior cerebellar artery (AICA) or posterior inferior cerebellar artery (PICA). Rarely caused by tumor or multiple sclerosis.
Treatment
Botulinum toxin injections: highly effective, first-line treatment — weakens overactive muscles for 3–4 months. Microvascular decompression surgery: moves the compressing blood vessel — definitive cure for appropriate candidates. Oral medications (baclofen, anticonvulsants) provide limited benefit.
When to seek professional evaluation
Hemifacial spasm is distinguished from Bell's palsy, facial tics and psychogenic movement disorders — accurate diagnosis guides treatment choice.
This guide is educational and does not replace individual medical advice.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
No. Essential tremor is more common and occurs on action. Parkinsonian tremor is classically at rest with slowness and stiffness. Only examination distinguishes.
Yes, stress, fatigue, and caffeine often amplify tremor amplitude but do not cause the underlying disorder.
Migraine is a neurological condition; headache is one feature. Associated symptoms and functional impact are important for diagnosis.
Aura refers to visual, sensory, or speech symptoms that precede the headache in some people. Both types are migraine; the presence of aura may influence management discussion.
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-11-10
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.