In left-sided facial palsy, the patient’s mouth is usually turned to the right side and may also have a shallow nasolabial fold on the left side and leakage from the left corner of the mouth when whistling. If peripheral facial palsy is considered, the patient may also have loss of the left frontal line, incomplete eyelid closure, and the white tympanic membrane may be exposed when the eyes are closed, also known clinically as the bell phenomenon. The common disease causing peripheral facial palsy is idiopathic facial nerve palsy, and also seen in patients with Green-Barre syndrome. If central facial palsy is considered, the patient usually has no frontal stripe disappearance or Bell phenomenon. Common diseases include cerebrovascular disease, mainly seen in cerebral infarction or cerebral hemorrhage, and also seen in cranial tumor; if there is cranial inflammation, some patients may also appear. The main thing is to actively treat the primary disease, and acupuncture treatment or rehabilitation can be done after the condition is stabilized.