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What's The Bell's Palsy? Facial nerve palsy is also known as Bell's palsy. The cause is unknown. It is usually thought that the blood vessels of the local nutrient nerves spasm due to wind and cold, which leads to ischemia and edema of the nerve tissue. It may also be related to local infection.The clinical manifestations are rapid onset, the patient’s mouth angle is vortex, one eyelid cannot be closed, tears, slurred speech, drooling, etc. Clinic Research for Bell's Palsy by Laser In 1997, Lian Fengjiang in China reported that 18 cases of facial nerve paralysis were treated with laser...