What is hemifacial spasm, and can it be treated?

Aug 15, 2021 Source: Cainiu Health

Dr. Cheng Aixia

Introduction

What is hemifacial spasm, and can it be treated? Hemifacial spasm—also known as facial tic—is characterized by involuntary twitching of muscles on one side of the face. The twitching occurs paroxysmally and irregularly, with varying severity, and may worsen with fatigue, emotional stress, or voluntary movement. Onset typically begins in the orbicularis oculi muscle and gradually spreads to involve the entire ipsilateral face. This condition most commonly develops after middle age and is more frequently observed in women.

Hemifacial spasm (HFS), also known as facial tic, is characterized by involuntary, unilateral facial muscle twitching. The twitching occurs paroxysmally and irregularly, varying in severity, and may worsen with fatigue, mental stress, or voluntary movement. Onset typically begins in the orbicularis oculi muscle and subsequently spreads to involve the entire ipsilateral face. HFS most commonly develops after middle age and is more prevalent in women. This condition significantly impairs patients’ facial expression, disrupts rest, interferes with work performance, and hinders social interactions.

In early-stage management, pharmacotherapy is often employed. However, aside from antiepileptic agents such as phenytoin or carbamazepine—which may offer limited benefit in mild cases—most central nervous system sedatives, inhibitors, and corticosteroids demonstrate no significant therapeutic efficacy.Acupuncture is generally not recommended for HFS, as the condition itself is highly sensitive to stimulation; acupuncture may exacerbate symptoms in some patients. Although transient improvement may occur immediately after treatment, symptom recurrence may be more severe thereafter. Moreover, long-term use of antiepileptic drugs like carbamazepine or phenytoin only provides symptomatic control and carries substantial adverse effects; thus, routine administration is not advised.

Supplementation with vitamin B1 or B12 may be attempted, though clinical benefits are minimal.Botulinum toxin injection offers effective, albeit temporary, control of hemifacial spasm, with a single injection typically providing relief for up to six months to one year. In addition to its therapeutic effect, this minimally invasive, painless procedure also yields cosmetic benefits such as wrinkle reduction. Consequently, botulinum toxin injection is currently considered one of the most favorable treatment options. For severe cases or those refractory to medical therapy, microvascular decompression surgery remains a viable alternative.

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