A condition in which the parathyroid gland (one of four pea-sized organs found on the thyroid) makes too much parathyroid hormone. This causes a loss of calcium from the bones and an increased level of calcium in the blood. Symptoms include bone pain and kidney problems.

A condition of abnormally elevated output of PARATHYROID HORMONE (or PTH) triggering responses that increase blood CALCIUM. It is characterized by HYPERCALCEMIA and BONE RESORPTION, eventually leading to bone diseases. PRIMARY HYPERPARATHYROIDISM is caused by parathyroid HYPERPLASIA or PARATHYROID NEOPLASMS. SECONDARY HYPERPARATHYROIDISM is increased PTH secretion in response to HYPOCALCEMIA, usually caused by chronic KIDNEY DISEASES.

Abnormally increased activity of the parathyroid glands, which may be primary or secondary; primary hyperparathyroidism is associated with neoplasia or hyperplasia; excess of parathyroid hormone leads to alteration in function of bone, renal tubules, and gastrointestinal mucosa.

Elevated concentration of parathyroid hormone. Causes include conditions originating within the parathyroid glands (primary), in response to hypocalcemia and hyperphosphatemia (secondary), and renal disease (tertiary). Characteristics may include polyuria, polydipsia, constipation, lethargy, cognitive dysfunction, hypercalciuria, nephrolithiasis, and bone demineralization or reduced bone mineral density.

Excessive production of parathyroid hormone (PTH) by the parathyroid glands.

Hyperfunction of the parathyroid glands resulting in the overproduction of parathyroid hormone. It may be primary or secondary; primary hyperparathyroidism is caused by parathyroid adenoma, parathyroid hyperplasia, parathyroid carcinoma, and multiple endocrine neoplasia. It is associated with hypercalcemia and hypophosphatemia. Signs and symptoms include weakness, fatigue, nausea, vomiting, constipation, depression, bone pain, osteoporosis, cystic bone lesions, and kidney stones. Secondary hyperparathyroidism is caused by the chronic stimulation of the parathyroid glands in patients with chronic renal failure, rickets, and malabsorption syndromes.

Overproduction by the thyroid glands of parathyroid hormone.

A disorder characterized by an increase in production of parathyroid hormone by the parathyroid glands. This results in hypercalcemia (abnormally high levels of calcium in the blood).

Hyperparathyroidism occurs when one or more of the parathyroid glands become overactive, causing elevated serum levels of parathyroid hormone and leading to hypercalcemia. Patients may be asymptomatic or have symptoms of varying severity, including chronic fatigue, body aches, difficulty sleeping, bone pain, memory loss, poor...

Through their secretion of parathyroid hormone (PTH), the parathyroid glands are primarily responsible for maintaining extracellular calcium concentrations. Hyperparathyroidism is a disease characterized by excessive secretion of parathyroid hormone, an 84�amino acid polypeptide hormone.

Hyperparathyroidism is when your parathyroid glands create too much parathyroid hormone in the bloodstream. These glands, located behind the thyroid at the bottom of your neck, are about the size of a grain of rice.

Hyperparathyroidism, abnormal increase in the secretion of parathormone by one or more parathyroid glands. Hyperparathyroidism may be primary or secondary. In primary hyperparathyroidism, one or more parathyroid glands produces excessive amounts of parathormone. This causes an increase in serum...