Table.

Etiology of Periodic Paralysis

Inherited Periodic Paralysis	Acquired Periodic Paralysis
Chloride channel disorders Autosomal dominant myotonia congenita (Thomsen) Autosomal recessive myotonia congenita (Becker)	Secondary hyperkalemic periodic paralysis may be seen in association with: renal failure adrenal failure hypoaldosteronism metabolic acidosis
Sodium channel disorders Paramyotonia congenital (Eulenburg) Hyperkalemic periodic paralysis	Secondary hypokalemic periodic paralysis may be seen in association with: hyperthyroidism, especially in Asian adults primary hyperaldosteronism diuretics inadequate potassium intake chronic licorice ingestion excessive potassium loss through sweat GI or renal wasting steroid use
Andersen syndrome
Schwartz-Jampel syndrome
Hypokalemic periodic paralysis, types 1 and 2