Facial spasm is a paroxysmal involuntary twitching of the hemifacial muscles, usually confined to one side of the face, thus it is also called hemifacial spasm, occasionally seen in both sides. It starts from the orbicularis oculi muscle and gradually develops to the cheeks and even the whole face, and the reverse development is less common. It can be aggravated by fatigue and tension, especially when speaking and smiling, and can become spastic in severe cases. It mostly starts in middle age, with the youngest age reported to be two years old. In recent years, statistics have shown that the onset of HFS is independent of gender, and in a few cases, mild facial paralysis may develop. Clinical manifestations: Facial spasms are twitching on one side of the face (some individuals have bilateral spasms), and the more nervous and excited the spasms are, the more severe they become. The initial symptom of facial myospasm is eyelid jumping, which is also known as “left eye jumping for money, right eye jumping for disaster”, so it usually does not attract people’s attention, but after a period of time, the lesion will develop into facial myospasm, which will move to the corner of the mouth, and in serious cases, to the neck. Facial muscle spasm can be divided into two types, one is primary facial muscle spasm and the other is facial muscle spasm produced by the sequelae of facial paralysis. The two types can be distinguished by their symptom presentation. In primary facial myospasm, it can occur even in the resting state, and the spasm is relieved after a few minutes and is uncontrolled; in facial myospasm produced by the sequelae of facial palsy, it is produced only when doing actions such as blinking and raising eyebrows.