Hyperparathyroidism is a hormonal problem that can develop at any age, but occurs most commonly in postmenopausal women (2% of older women and 1% of older men).
Hyperparathyroidism develops because of excessive secretion of parathyroid hormone (PTH), an important factor in calcium metabolism. It can lead to high PTH levels, high calcium levels, and a wide range of symptoms.
Parathyroid gland anatomy:
Most people are born with four parathyroid glands, though having an extra 5th parathyroid gland is not all that uncommon. Parathyroid glands are located in the neck, generally behind the thyroid gland, but can be found in unusual locations such as the carotid sheath, thymus, chest, or behind your esophagus.