Facial nerve injury is distressing and poorly served. Most people are given steroids, told it will probably resolve, and sent away. For many that is enough. For a significant minority it is not, and the outcome depends heavily on what happens in the months in between.
What Bell’s palsy is
Sudden weakness or paralysis of the muscles on one side of the face, caused by inflammation of the facial nerve. Onset is typically rapid, over hours to a day or two.
It affects the whole side of the face, including the forehead. That is the distinguishing feature clinically, and it matters, because a stroke typically spares the forehead.
When it is an emergency
Sudden facial weakness can indicate a stroke. If the forehead still moves normally on the affected side, or there is weakness elsewhere in the body, difficulty speaking, or a severe headache, treat it as an emergency and go to hospital.
Get any sudden facial weakness assessed by a doctor urgently regardless, because steroid treatment is most effective when started within 72 hours.
Why the eye matters most in the early weeks
If the eye does not close fully, the cornea is exposed and at risk. Eye protection, including lubricating drops and taping the eye closed at night, is the highest priority in the acute phase.
This is the single most important practical thing and it is often mentioned briefly and then forgotten.
Why aggressive exercise early is a mistake
The instinct is to exercise the weak muscles hard. In facial nerve injury that is frequently counterproductive.
The facial nerve regenerates slowly, and as it does, fibres can regrow to the wrong muscles. That produces synkinesis, meaning unwanted linked movements, such as the eye closing when you smile, or the corner of the mouth pulling when you blink.
Synkinesis is one of the most troublesome long term outcomes and it is far easier to prevent than to treat. Aggressive, gross, forceful exercise during the reinnervation phase encourages it.
What helps instead is small, precise, controlled movement with visual feedback in a mirror, and specific relaxation work. Quality over effort, which is the opposite of most rehabilitation instincts.
What facial retraining involves
Assessment of which muscles are affected and to what degree. Education about the recovery timeline and what to expect. Eye protection strategy. Soft tissue work. Precise, mirror guided, controlled movement retraining rather than gross exercise. Synkinesis management where it has already developed. And support around the psychological impact, which is significant and routinely underestimated.
The timeline
Most Bell’s palsy recovers substantially within three to six months. Some recovers within weeks.
Where recovery is incomplete, or where synkinesis develops, facial retraining makes a meaningful difference and it is worth pursuing well beyond the point people are usually told to stop.
Other causes of facial nerve injury
Ramsay Hunt syndrome, which is shingles affecting the facial nerve and generally has a poorer prognosis. Acoustic neuroma surgery. Trauma and skull fractures. Parotid gland surgery. And congenital facial palsy.
The rehabilitation principles are broadly similar across these.
Why us
We run an accredited professional development course training other physiotherapists in facial nerve injury and associated health issues. There are very few practices in Australia with that depth in this area, and facial retraining is a specific skill rather than something general physiotherapy covers.
Call 08 8331 2700.
