It is important to see a doctor when one first notices signs of a hemifacial spasm, so evaluation and treatment can start early. In some instances, the spasms are an early symptom of multiple sclerosis, a disorder caused by the immune system attacking the central nervous system. MS is only the cause in one to six cases out of several hundred hemifacial spasm assessments. Doctors usually check for other signs of MS when a person under 40 presents with hemifacial spasm symptoms.

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