Facial paralysis happens when your facial nerve (cranial nerve #7) becomes damaged. This results in weakness, droopiness and a loss of facial movement on one side (unilateral) or both sides (bilateral) of your face.
Facial nerve damage can occur for several reasons, including infection, trauma or stroke. It can also occur without a known cause, which is referred to as Bell’s palsy. Face paralysis may complete or partial and can be temporary or permanent.
1- Your facial nerve, which transmits signals from your brain to your facial muscles, becomes damaged or swollen.
2- The area of your brain that carries signals to your facial muscles becomes damaged.
A healthcare provider will ask about your symptoms and review your medical history. They’ll perform a physical examination and ask you to try to make various facial movements, like:
1- Opening and closing your eyes.
2- Raising your eyebrows.
2- Smiling.
2- Frowning.