How is pathophysiology of hypoparathyroidism?

PTH absence causes no Ca reabsoption/resorption/ absorption so causes hypocalcemia w/ S&S of neuromuscular irritability (paresthesia, hyperirritability, fatigue, anxiety, mood swings, seizures, hoarseness, wheeze and dyspnea, muscle cramps/biliary colic, hypomagnesemia, hypokalemia and alkalosis (hyperventilation) worsen signs and symptoms of hypocalcemia.