Causes of Hypokalemia

GI Losses
Kidney Urinary Loss
Poor oral intake
Insulin
Hyperthyroidism
Iatrogenic Cushings
Hypocalcemia
Bartter Genetic Syndrome = recessive derangement of renal tubule resulting in sodium, potassium, chloride loss.
Metabolic Alkalosis
Hypomagnesemia
Hyperaldosteronism = Conn's Syndrome,

Tx: K-sparing diuretics, antiemetics, KCl infusion.