Parathyroid hormone is secreted by the parathyroid master cells, and its main function is to regulate calcium and phosphorus metabolism in the body. The causes of elevated levels include parathyroid hyperplasia, parathyroid adenoma and chronic renal insufficiency. 1. Parathyroid hyperplasia: the secretion of parathyroid master cells increases with the growth of parathyroid glands, leading to the elevation of parathyroid hormone level. 2. Parathyroid adenoma: Functional adenoma of the parathyroid glands, which has its own secretion function, will also directly lead to an increase in parathyroid hormone secretion. 3. Chronic renal insufficiency: Chronic renal insufficiency will lead to a decrease in calcium reabsorption, resulting in a decrease in blood calcium and an increase in blood phosphorus, which will stimulate the secretion of parathyroid hormone through negative feedback. If you find elevated parathyroid hormone, you need to consult a doctor in time to clarify the specific cause of the disease and standardize the treatment under the guidance of the clinician.