Most people have four parathyroid glands, each about the size of a grain of rice. They are located behind the thyroid gland in the neck.
The parathyroid glands regulate the amount of calcium in the blood by the production of parathyroid hormone (PTH).
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This information is provided by the Department of Surgery at the University of Colorado School of Medicine. It is not intended to replace the medical advice of your doctor or healthcare provider. Please consult your healthcare provider for advice about a specific medical condition.