Tertiary Hyperparathyroidism

Tertiary Hyperparathyroidism is a condition that affects the parathyroid glands, which are small glands in the neck that help regulate calcium levels in the body. It usually develops after long-standing problems with the kidneys, causing the parathyroid glands to become overactive and produce too much parathyroid hormone (PTH). This excess hormone causes the body to release too much calcium from the bones into the blood, leading to high blood calcium levels. The condition can cause symptoms like bone pain, muscle weakness, and kidney stones. It mainly affects the skeletal system and the kidneys, disrupting normal calcium balance and bone health.

Tertiary Hyperparathyroidism is characterized by autonomous and excessive secretion of parathyroid hormone (PTH) following prolonged secondary hyperparathyroidism, typically due to chronic kidney disease. The persistent stimulation of the parathyroid glands by hypocalcemia and hyperphosphatemia leads to gland hyperplasia and loss of normal feedback regulation. This results in hypercalcemia despite correction of the initial cause, distinguishing it from secondary hyperparathyroidism. The condition is clinically significant because it causes bone resorption, soft tissue calcifications, and nephrolithiasis. It often occurs in patients with end-stage renal disease who have undergone renal transplantation or remain on dialysis. Diagnosis and management are critical to prevent complications such as osteitis fibrosa cystica and vascular calcifications.