Final answer:
Hyperparathyroidism is the primary cause of high PTH and high calcium levels. It involves the overproduction of PTH by the parathyroid glands, which leads to increased release of calcium from bones and decreased excretion of calcium by the kidneys. This condition can have various symptoms and complications.
Step-by-step explanation:
Hyperparathyroidism is the primary cause of high PTH (parathyroid hormone) and high calcium levels. This condition occurs due to the overproduction of PTH by the parathyroid glands, which leads to increased release of calcium from bones and decreased excretion of calcium by the kidneys. The high calcium levels in the blood can cause various symptoms and complications, such as bone weakening, kidney stones, and impairments in the functioning of tissues and organs.