Deficiency Hypomagnesemia causes poor diet alcoholism poorly controlled diabetes presentation hyperexcitability muscle cramps tetany palpitations hypocalcemia login to view 3 more bullets hypokalemia login to view 2 more bullets diagnosis serum magnesium level login to view 2 more bullets Hypermagnesemia causes renal failure exogenous usage (preeclampsia, eclampsia) presentation apnea areflexia paralysis treatment stop giving magnesium calcium