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Parathyroid glands

2-minute read

The parathyroid glands are 4 small glands, each about the size of a grain of rice. There are usually 2 on each side of the neck, sitting behind another gland called the thyroid gland.

What do the parathyroid glands do?

The parathyroid glands make parathyroid hormone. Parathyroid hormone helps to control how much calcium is in the blood.

Calcium is important for the proper functioning of nerves, muscles, bones, the heart and kidneys.

What medical conditions are related to the parathyroid glands?

Sometimes the parathyroid glands produce too much parathyroid hormone. This condition is called hyperparathyroidism. It is usually because of a non-cancerous growth on the gland or because the glands have grown too big. In rare cases, it can be due to cancer.

If you have too much parathyroid hormone, your body can take too much calcium away from your bones, and put calcium into your blood instead. This means that when you have a blood test, it will show the calcium levels are too high.

A loss of calcium from the bones increases the risk of osteoporosis, which is where the bones become thinner and can break more easily. But not everyone who has osteoporosis has a parathyroid problem.

A parathyroid problem might also make you feel tired, and it can cause kidney stones, stomach pains, or pains in the joints.

If a parathyroid gland problem leads to you having one of these conditions, your doctor might recommend surgery to remove one or more of your parathyroid glands. There are different techniques for this kind of surgery. You should talk to your doctor for more information about what treatment you might need and what to expect.

Another condition related to the parathyroid gland is hypoparathyroidism, which is when the glands don’t make enough parathyroid hormone. It usually happens if the parathyroid glands are damaged or destroyed during surgery to remove the thyroid. If you are having surgery on your thyroid, you will probably be given extra calcium for a few weeks while the parathyroid glands recover.

More information

Learn more about the endocrine system and the different hormones released by the endocrine glands.

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: November 2020

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