Facial paralysis occurs when the facial nerve fibers are irritated or disrupted. A number of factors can cause this, including infections, injuries, tumors, and strokes. The most common factor is a condition known as Bell’s palsy.
Other conditions that can cause facial paralysis include physical trauma, stroke, Lyme disease, sarcoidosis, Moebius syndrome, herpes and tumors.
Facial paralysis can affect anyone, but it is most prominent in people over the age of 40 or those with diabetes, upper respiratory disorders, weakened immune systems, and pregnant women.