Hypercalcemia caused by -

hypercalcemia can be a manifestation of a serious illness.Although hyper parathyroidism , a frequent cause of asymptomatic hypercalcemia, is a chronic disorder in which manifestations may be expressed only after months or years.The cause of hypercalcemia is numerous,but hyper parathyroidism. Hypercalcemia from any cause can result in fatigue, depression, mental confusion, anorexia , vomiting, constipation, reversible renal tubular defects, increased urination,sho PQ interval , cardiac arrhythmias. Generally, symptoms are more common at ca level >2.9-3mmol/l(Harrison 17 pg 2380)