Hypercalcemia causes
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Common Causes of Hypercalcemia: Hyperparathyroidism and Malignancy
The vast majority of hypercalcemia cases—about 90%—are caused by either primary hyperparathyroidism or malignancy. Primary hyperparathyroidism leads to increased secretion of parathyroid hormone (PTH), which raises blood calcium levels. Malignancy-related hypercalcemia often results from tumors producing PTH-related protein (PTHrP) or from bone metastases that increase bone resorption and release calcium into the bloodstream Z̆ofková2016Motlaghzadeh2021Calabrese2025+2 MORE.
Less Common and Rare Causes of Hypercalcemia
While most cases are due to the above, a variety of less common and rare causes exist. These include:
- Granulomatous Diseases: Conditions like sarcoidosis and tuberculosis can cause increased production of active vitamin D (1,25-dihydroxyvitamin D), leading to increased calcium absorption from the gut Z̆ofková2016Tebben2016Walker2022.
- Endocrinopathies: Disorders such as hyperthyroidism and adrenal insufficiency can disrupt calcium balance Z̆ofková2016Walker2022.
- Medications and Supplements: Thiazide diuretics, lithium, excessive vitamin D or vitamin A, and calcium supplements can all contribute to elevated calcium levels Z̆ofková2016Tebben2016Calabrese2025+1 MORE.
- Renal Failure and Kidney Transplantation: Impaired kidney function can reduce calcium excretion and alter vitamin D metabolism, leading to hypercalcemia .
- Immobilization: Prolonged immobility, especially in individuals with high bone turnover, can cause bone resorption and hypercalcemia .
- Milk-Alkali Syndrome: Excessive intake of calcium and absorbable alkali can result in hypercalcemia Jacobs2005Jacobs2005.
- Genetic Disorders: Familial hypocalciuric hypercalcemia (FHH) is caused by mutations in the calcium-sensing receptor gene, and other genetic mutations (such as in CYP24A1) can also lead to hypercalcemia Z̆ofková2016Tebben2016Stokes2017+1 MORE.
Pediatric Hypercalcemia: Unique Considerations
In children, hypercalcemia can be either PTH-dependent or PTH-independent. PTH-independent causes are more common and include vitamin D intoxication, granulomatous diseases, and certain genetic syndromes like Williams syndrome and idiopathic infantile hypercalcemia. PTH-dependent causes in children are often due to parathyroid tumors or genetic conditions such as FHH Stokes2017Lietman2010.
Diagnostic Approach: Distinguishing the Cause
The first step in evaluating hypercalcemia is measuring serum PTH. An elevated or inappropriately normal PTH suggests primary hyperparathyroidism or related genetic disorders. A suppressed PTH points toward malignancy, vitamin D-related causes, granulomatous disease, medication effects, or other rare conditions Calabrese2025Walker2022Minisola2015.
Conclusion
Hypercalcemia is most commonly caused by primary hyperparathyroidism and malignancy, but a wide range of other conditions—including granulomatous diseases, endocrinopathies, medications, renal failure, immobilization, and genetic disorders—can also be responsible. Identifying the underlying cause is essential for effective management and often begins with measuring serum PTH to guide further investigation Z̆ofková2016Motlaghzadeh2021Tebben2016+7 MORE.
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