Glycogen storage disease is any one of several metabolic disorders that result from enzyme defects that affect the processing of glycogen within muscles and other cell types.

There are eight diseases that are commonly considered to be glycogen storage diseases:

  • GSD type I: von Guerke's disease
  • GSD type II: acid maltase deficiency
  • GSD type III: debrancher deficiency
  • GSD type IV: Andersen disease
  • GSD type V: McArdle disease
  • GSD type VI: liver phosphorylase deficiency
  • GSD type VII: muscle phosphofructokinase deficiency
  • GSD type IX: phosphorylase kinase deficiency