Hemifacial Spasm: Causes, Symptoms and Treatment

How Is Hemifacial Spasm Diagnosed?

Diagnosis usually begins with a detailed medical history and clinical examination. A specialist will assess the location and pattern of the contractions, how symptoms have developed and whether other neurological signs are present.

A neurological examination may also be performed to assess facial nerve function. Magnetic resonance imaging may be recommended to examine the course of the facial nerve, identify possible vascular compression and exclude other structural causes of the symptoms.

Additional investigations may occasionally be required depending on the patient’s symptoms and clinical findings. The aim is to confirm the diagnosis and establish whether an underlying cause may affect treatment planning.

Hemifacial Spasm Treatment

Treatment for hemifacial spasm depends on the severity of the contractions, their impact on everyday life and the underlying cause. Options range from treatments that temporarily control muscle activity to surgery aimed at addressing facial nerve compression in appropriately selected patients.

BoNT injections are commonly used to reduce involuntary contractions and can provide effective symptom control without surgery.

BoNT Injections for Hemifacial Spasm

Botulinum toxin (BoNT) injections temporarily reduce the nerve signals that cause selected facial muscles to contract. Clinicians carefully inject small amounts into the muscles affected by spasms, tailoring the injection pattern to each patient’s symptoms.

Improvement typically begins within several days following treatment. Because BoNT’s effect is temporary, muscle activity gradually returns, and repeat injections are generally required to maintain symptom control.

Careful placement is particularly important when treating muscles around the eyes and face. Treatment can therefore be adjusted over time according to which muscles are affected and how the patient responds to previous injections.

Medication

Oral medications that affect nerve or muscle activity may be considered for some patients with hemifacial spasm. However, their effectiveness varies, and potential side effects can limit their suitability for long-term treatment.

Your specialist can advise whether medication has a role based on the severity of your symptoms, general health and other treatment options available.

Surgery for Hemifacial Spasm

For selected patients whose hemifacial spasm is caused by vascular compression of the facial nerve, a surgical procedure called microvascular decompression may be considered. Rather than temporarily reducing muscle contractions, the procedure aims to address the underlying nerve compression.

During microvascular decompression, the surgeon identifies the blood vessel pressing against the facial nerve and carefully separates the two, typically placing material between them to prevent further contact.

This specialist neurosurgical procedure is not appropriate for every patient with hemifacial spasm. Whether surgery is appropriate depends on factors including the underlying cause, symptom severity, general health, and the procedure’s potential benefits and risks. A specialist neurological or neurosurgical assessment is therefore required.

FAQ

Is hemifacial spasm serious?

Hemifacial spasm is not usually life-threatening, but persistent symptoms can significantly affect everyday life. Frequent contractions around the eye can interfere with vision, while spasms involving other facial muscles may affect facial expression, confidence and social interactions.

In some cases, hemifacial spasm can also be associated with an underlying problem affecting the facial nerve. Specialist assessment is therefore important both to confirm the diagnosis and determine whether further investigation is required.

Is hemifacial spasm painful?

Hemifacial spasm is generally not painful. The repeated contractions may, however, cause discomfort, tightness or fatigue in the affected facial muscles, particularly when spasms are frequent.

Discuss new facial pain or other neurological symptoms with a medical professional, as they may indicate another condition requiring assessment.

What triggers hemifacial spasm?

Symptoms can sometimes become more noticeable during periods of stress, tiredness or anxiety, although individual triggers vary. These factors do not necessarily cause hemifacial spasm but may increase the frequency or intensity of existing contractions.

Tracking when symptoms worsen can help identify individual patterns and may support a broader symptom-management strategy.

Can hemifacial spasm affect both sides of the face?

Hemifacial spasm characteristically affects one side of the face. Symptoms affecting both sides are unusual and may suggest a different movement disorder or another underlying cause.

If you experience persistent involuntary movements on both sides of the face, a specialist assessment can help determine the cause.

Is hemifacial spasm the same as blepharospasm?

No. Although both conditions can cause involuntary contractions around the eyes, they have different patterns and underlying mechanisms. Hemifacial spasm typically affects muscles on one side of the face and is often associated with irritation or compression of the facial nerve.

Blepharospasm usually affects both eyes and is a neurological movement disorder involving abnormal control of blinking and eyelid closure. Learn more about the condition and available options on our blepharospasm treatment page.

Can BoNT stop hemifacial spasm permanently?

No. BoNT injections temporarily reduce activity in the muscles responsible for the spasms but do not permanently alter the underlying facial nerve problem. The effects gradually wear off, so repeat treatment is generally required to maintain symptom control.

For selected patients with confirmed vascular compression, microvascular decompression may address the underlying cause more directly, although suitability for surgery requires specialist assessment.

When should I see a specialist for facial spasms?

Occasional facial or eyelid twitching is common and does not necessarily indicate hemifacial spasm. However, specialist assessment is advisable if contractions persist, repeatedly affect the same side of the face, spread from the eye to other facial muscles, or begin to interfere with vision and everyday activities.

Assessment is also important if facial spasms occur alongside other new neurological symptoms, as further investigation may be required.