Electrical Stimulation and Facial Palsy

What is electrical stimulation?

Electrical stimulation involves applying electrical current to facial muscles or nerves using surface electrodes placed on the skin or through techniques such as electroacupuncture. It is sometimes proposed as a treatment to improve facial movement following facial nerve injury.

What does the evidence show?

The role of electrical stimulation in facial palsy rehabilitation remains controversial.
Some studies have reported potential benefits in certain groups of patients, particularly during the early stages of recovery following Bell’s palsy. However, the overall evidence base remains limited by small study sizes, variation in treatment methods, differences in patient populations and a lack of long-term follow-up.

At present, there is insufficient high-quality evidence to establish which patients may benefit most, what treatment parameters should be used, or whether electrical stimulation improves long-term facial movement quality compared with specialist facial rehabilitation.

Why are specialist facial therapists cautious?

The primary aim of facial rehabilitation is not simply to generate facial movement but to support the recovery of coordinated, selective and functional facial expression.

Following facial nerve injury, some patients develop synkinesis (unwanted facial movements occurring alongside intended movements), muscle tightness or abnormal movement patterns. Concerns have been raised that electrical stimulation may reinforce abnormal muscle activation in some individuals. However, the relationship between electrical stimulation and synkinesis remains uncertain and further research is needed.

For this reason, many specialist facial rehabilitation clinicians adopt a cautious approach until stronger evidence becomes available regarding long-term outcomes and safety.

What do current expert recommendations say?

An international consensus process involving specialist facial rehabilitation clinicians from multiple professions reviewed a wide range of assessment and treatment approaches used in facial palsy management.

Electrical stimulation did not achieve the level of agreement required for inclusion within the final consensus recommendations. This does not mean that electrical stimulation has been proven harmful or ineffective in all situations. Rather, it reflects the current lack of sufficient evidence and agreement regarding its routine use within facial rehabilitation practice.

What treatments are currently recommended?

Current rehabilitation approaches with a stronger evidence base include:

• Specialist assessment by clinicians experienced in facial palsy rehabilitation
• Facial neuromuscular retraining and movement re-education
• Individualised facial exercise programmes
• Education regarding facial recovery and symptom management
• Management of synkinesis where appropriate
• Botulinum toxin treatment when clinically indicated as part of a multidisciplinary approach

As research continues to evolve, recommendations may change. Facial Palsy UK regularly reviews emerging evidence and aims to provide balanced, evidence-informed information to support patient choice and informed decision-making.

Our position

Facial Palsy UK does not currently recommend routine use of electrical stimulation as part of facial palsy rehabilitation. This position is based on the present evidence base, which remains limited and inconclusive regarding long-term functional outcomes, movement quality and synkinesis.

We welcome ongoing high-quality research in this area and will continue to update our guidance as new evidence becomes available.