The parathyroid glands
There are 4 parathyroid glands that are attached to the back of the thyroid. There are usually 2 glands on each side of the thyroid. Sometimes they are found in different places (called ectopic parathyroid glands), such as elsewhere in the neck or in the chest.
The parathyroid glands are part of the endocrine system. Parathyroid glands make parathyroid hormone (PTH), which helps control the level of calcium in the blood. When blood calcium levels are low, the parathyroid gland releases PTH. This hormone stimulates cells in the bones to break down and release calcium into the blood. It also tells your intestines to absorb more calcium from your food, and it tells your kidneys to hold on to calcium and return it to your blood.
Find out more about the endocrine system and hormones.
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