There is a range of hereditary and sporadic diseases that affect the muscles leading to their weakness and destruction. These diseases can reveal themselves as weakness or cramps or pain or a combination of these symptoms.

There are 4 main classes of muscle disorders as mentioned below.

1. Metabolic Myopathies:

Disorders of metabolism of various energy sources and energy processing units cause sick muscles. These disorders include:

A. Disorders of carbohydrate metabolism.

B. Disorders of lipid metabolism.

C. Mitochondrial myopathies.