Parathyroid hormone-related
Primary hyperparathyroidism*
	Sporadic, familial, associated with multiple endocrine neoplasia I or II
Tertiary hyperparathyroidism
	Associated with chronic renal failure or vitamin D deficiency
Vitamin D-related
Vitamin D intoxication
	Usually 25-hydroxyvitamin D2 in over-the-counter supplements
Granulomatous disease sarcoidosis, berylliosis, tuberculosis
Hodgkin's lymphoma
Malignancy
Humoral hypercalcemia of malignancy* (mediated by PTHrP)
	Solid tumors, especially lung, head, and neck squamous cancers, renal cell tumors
Local osteolysis* (mediated by cytokines) multiple myeloma, breast cancer
Medications
Thiazide diuretics (usually mild)*
Lithium
Milk-alkali syndrome (from calcium antacids)
Vitamin A intoxication (including analogs used to treat acne)
Other endocrine disorders
Hyperthyroidism
Adrenal insufficiency
Acromegaly
Pheochromocytoma
Genetic disorders
Familial hypocalciuric hypercalcemia: mutated calcium-sensing receptor
Other
Immobilization, with high bone turnover (e.g., Paget's disease, bedridden child)
Recovery phase of rhabdomyolysis