Hereditary Continuous Muscle Fiber Activity, also known as continuous muscle fiber activity hereditary, is related to episodic ataxia, type 1 and episodic ataxia. An important gene associated with Hereditary Continuous Muscle Fiber Activity is KCNA1 (Potassium Voltage-Gated Channel Subfamily A Member 1). Related phenotypes are abnormality of movement and elevated circulating creatine kinase concentration