28/10/2026
Why does an eye sometimes close when someone smiles after facial palsy?
The answer can lie in how the facial nerve regenerates.
After a significant facial nerve injury, damaged nerve fibres may begin to regrow. Ideally, regenerating axons reconnect with their original muscle targets. However, regeneration is not always perfectly organised. Some fibres may be misdirected and ultimately activate a different group of facial muscles.
The result? When the brain sends a signal for one intended facial movement, additional muscles may activate at the same time.
For example, a person may try to smile and notice the eye narrowing or closing. Others may experience mouth movement during eye closure or unwanted neck/platysma contraction during smiling.
This involuntary linked movement is called synkinesis.
Importantly, synkinesis does not simply mean that the face is still weak. The rehabilitation priorities have changed. Treatment may need to focus less on generating more movement and more on improving movement selectivity, reducing excessive muscle activity and retraining coordination.
Movement has returned, but is your face moving differently?
If smiling causes your eye to close, your neck to tighten, or other parts of your face to move unintentionally, it may be time to reassess how your facial nerve has recovered.
Facial Palsy SA | Understanding movement. Retraining control.
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www.facialpalsysa.com