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Causes
By Mayo Clinic staff
Hypoparathyroidism occurs when your parathyroid glands don't secrete enough parathyroid hormone. You have four parathyroid glands — each about the size of a grain of rice — located in your neck, adjacent to your thyroid gland.
The low production of parathyroid hormone leads to abnormally reduced calcium levels (hypocalcemia) in your blood and bones and to increased amount of phosphorus (hyperphosphatemia).
Factors that can cause hypoparathyroidism include:
- Acquired hypoparathyroidism. This is the most common cause of hypoparathyroidism, and it develops after accidental damage to or removal of the parathyroid glands during surgery. This surgery may be a treatment for diseases of the nearby thyroid gland, or for throat cancer or neck cancer. The loss of function may be temporary, though it can also be permanent. Today, surgeons are aware of and more careful to avoid injuring the parathyroid glands in the course of surgery.
- Hereditary hypoparathyroidism. In this form, either the parathyroid glands aren't present at birth or they don't work properly.
- Autoimmune disease. In this condition, your immune system creates antibodies against the parathyroid tissues, trying to reject them as if they were foreign bodies. In the process, the parathyroid glands stop manufacturing their hormone.
- Extensive cancer radiation treatment of your face or neck, which can result in destruction of your parathyroid glands, or occasionally because of radioactive iodine treatment for hyperthyroidism.
- Low levels of magnesium in your blood, which can affect the function of your parathyroid glands. Normal magnesium levels are required for optimum secretion of parathyroid hormone.
- Hypoparathyroidism. Eunice Kennedy Shriver National Institute of Child Health and Human Development. http://www.nichd.nih.gov/health/topics/hypoparathyroidism.cfm. Accessed March 8, 2009.
- Shoback D. Hypoparathyroidism. New England Journal of Medicine. 2008;359:391.
- Hueston WJ, et al. Endocrine disorders. In: South-Paul JE, et al. Current Diagnosis & Treatment in Family Medicine. 2nd ed. New York, N.Y.: McGraw-Hill/Lange; 2007. http://www.accessmedicine.com/content.aspx?aID=3034534. Accessed March 8, 2009.
- Fitzgerald PA. Endocrine disorders. In: McPhee SJ, et al. Current Medical Diagnosis & Treatment 2009. 48th ed. Los Altos, Calif.: Lange Medical Publications; 2009. http://www.accessmedicine.com/content.aspx?aID=14198. Accessed March 8, 2009.
- Disorders of calcium concentration. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/print/sec12/ch156/ch156g.html. Accessed March 8, 2009.
- Dietary supplement fact sheet: Calcium. Office of Dietary Supplements. http://ods.od.nih.gov/factsheets/calcium.asp. Accessed March 8, 2009.
