G73: Disorders of myoneural junction and muscle in diseases classified elsewhere

G73.6: Myopathy in metabolic diseases

Various energy-acquisition processes occur in the body. The body acquires energy, for example, by breaking down nutrient elements or the body's own substances. Broken down nutrient elements are also used as building materials in the body. In this way, individual cells and tissue can be built or repaired. All of these processes together are known as metabolism. Various metabolic disorders can affect the muscles. These may be illnesses that affect the metabolism of sugars or fats.

With this muscle disorder, the muscles may be weaker than usual. The muscles may also cramp up or be sore.