Hypoparathyroidism
Also called: low parathyroid hormone, underactive parathyroid
What it means
Hypoparathyroidism is a condition where the parathyroid glands make too little parathyroid hormone, leading to low blood calcium and high phosphate levels.
This condition disrupts the hormone that controls calcium balance, which can affect bone structure and overall skeletal health.
Hypoparathyroidism means the parathyroid glands, four tiny glands in the neck, don't make enough parathyroid hormone (PTH). PTH normally keeps blood calcium steady by pulling calcium from bone, boosting absorption in the gut, and helping the kidneys hold onto calcium. Without enough PTH, blood calcium drops and phosphate rises, which can cause muscle cramps, tingling, fatigue, and in some cases bone and dental changes.
The most common cause is damage to or removal of the parathyroid glands during neck or thyroid surgery. Less often it's autoimmune, genetic, or linked to very low magnesium, since magnesium is needed for the glands to release PTH properly - severe magnesium deficiency can look like hypoparathyroidism even when the glands are normal.
Because PTH helps regulate how bone is built and broken down, people with hypoparathyroidism can have unusually dense or altered bone compared to those with too much PTH (hyperparathyroidism). Treatment usually involves calcium and active vitamin D, sometimes PTH-replacement therapy, managed carefully by an endocrinologist since levels need regular monitoring. Any changes to treatment should always go through your prescribing doctor.
How sure is this?
Graded Established Science: Supported by broad scientific consensus and decades of research. Read each study with its grade in mind. One study is a piece of the picture, not the whole of it.
Too little parathyroid hormone causes low blood calcium and high phosphate, which can affect your bone structure and skeletal health.
Where this leads
WordHypoparathyroidism disrupts calcium balance through low PTH. Want to know how a simple blood test can reveal correctable causes of bone loss?
Where the Academy teaches it
This page is the short version. The lessons teach it in full, with the context around it and a quiz to lock it in.
Related words
Hyperparathyroidism is when overactive parathyroid glands release too much hormone, causing your bones to lose…
Parathyroid gland disorders happen when the small glands in your neck that control blood calcium make too much or…
Calcium is the main building-block mineral in bone, and since your body can't make it, you need to get it from food…
Magnesium is a mineral that helps activate vitamin D and forms part of the actual crystal structure of bone.
Vitamin D is a nutrient that helps your gut absorb calcium so it can be used to build and maintain bone.
A parathyroid hormone (PTH) test measures the amount of PTH in your blood, usually alongside calcium, to help find…
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.
