Tertiary hyperparathyroidism
What it means
Tertiary hyperparathyroidism happens when the parathyroid glands make too much parathyroid hormone (PTH) on their own, even after the original cause of overactivity is fixed. It most often develops after long-term secondary hyperparathyroidism, usually from kidney disease.
Too much PTH over a long time pulls calcium out of bone, which can weaken bones and raise fracture risk.
Tertiary hyperparathyroidism usually develops after years of secondary hyperparathyroidism, which is typically driven by chronic kidney disease. In that setting, low calcium and high phosphate push the parathyroid glands to work overtime. Over time, the glands can become so used to overproducing hormone that they keep doing it even if the kidney problem improves or calcium levels normalize, including after a kidney transplant.
Once this happens, blood calcium often rises instead of staying low, because the parathyroid glands are now acting independently of the body's normal feedback signals. This excess PTH increases bone turnover, drawing calcium from bone matrix into the bloodstream, which over time can reduce bone density and raise the risk of fragility fractures.
Diagnosis usually involves blood tests for calcium, phosphate, and parathyroid hormone, along with assessment of kidney function. Management is handled by a doctor or endocrinologist and may include medication or, in some cases, surgery to remove overactive parathyroid tissue. Anyone with kidney disease or a history of secondary hyperparathyroidism should have this monitored by their care team rather than self-managed.
Long-term secondary hyperparathyroidism can turn into parathyroid glands overacting on their own, pulling calcium from bone.
Where this leads
WordTertiary usually develops after long-term secondary hyperparathyroidism. Curious what that earlier stage looks like and why it starts with kidney disease or low vitamin D?
Related words
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Education only, not medical advice. Decisions about tests, medications and treatment belong with your own doctor. OsteoStrong does not diagnose, treat or cure any disease.
