This document discusses different types of muscle channelopathies and disorders including myotonia, myasthenia, malignant hyperthermia, muscular dystrophies, and metabolic myopathies. It describes the causes, symptoms, and treatments for each condition. Channelopathies are caused by ion channel dysfunction from genetic mutations or autoimmune attack. Therapies aim to improve symptoms, slow muscle loss, and relieve pain through drugs, physical therapy, assistive devices, and surgery.