What is hyperparathyroidism?

Hyperparathyroidism is a condition in which one or more of your parathyroid glands become overactive and release (secrete) too much parathyroid hormone (PTH). This causes the levels of calcium in your blood to rise, a condition known as hypercalcemia.

What are the parathyroid glands?

Your parathyroid glands secrete PTH to help control the levels of calcium and phosphorous in your body. You have four parathyroid glands, located on the outside borders on the backside of your thyroid gland. Your thyroid gland is located on the front of your neck.


What happens when there’s too much parathyroid hormone (PTH) circulating in my body?

If you have an overactive parathyroid, one or more of your parathyroid glands makes too much parathyroid hormone (PTH). Too much PTH signals your body to make more calcium available. Your body responds by:


Releasing more calcium into your blood from your bones (where most of your calcium is stored). Loss of calcium from your bones weakens them and increases your risk of a fracture.

Having your digestive tract absorb more calcium from the foods you eat.

Having your kidneys retain calcium and return it to your blood instead of flushing it out in your urine. Too much calcium in your kidneys can cause kidney stones to form

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