Use this mnemonic "RED FETS"
Renal disease: ARF, CKD, Type IV RTA
Excessive intake: food, K+ iv fluids, Blood transfusion
Drugs: K+ sparing diuretics, K+ salts of penicillin
Factitious: Prolonged use of torniquet, Hemolysis
Endocrine: Addison's disease
Tissue release: Rhabdomyolysis, burns, hemolysis, cytotoxic therapy
Shift out of cell: Acidosis, B antagonists, Insulin deficiency, Tissue damage