GI: Chronic malnutrition/malabsorption, chronic diarrhea

Renal: Post-obstructive diuresis, post-ATN

Endocrine: Hyper/hypoparathyrordism

Redistribution: Hungry bone, acute pancreatitis

Other: Uncontrolled DM, chronic alcoholism

Acute or Chronic renal failure

Tumor Lysis Syndrome

Re-feeding syndrome

Rhabdomyolysis

Hyper/hypoparathyroidism

DKA

Severe lactic acidosis