The parathyroid glands are one of the endocrine organs of the human body. There are two pairs of parathyroid glands, brownish-yellow in color and shaped like soybeans, located on the back of the left and right lobes of the thyroid gland or buried in the middle and lower part of them, whose main function is to regulate calcium and phosphorus metabolism in the body by parathyroid hormone, or PTH for short. Hypothyroidism or complete removal of the parathyroid glands can cause insufficient secretion of parathyroid hormone, resulting in a gradual decrease in blood calcium and a gradual increase in blood phosphorus, leading to hypocalcemic convulsions and even death. Supplementation of parathyroid hormone and calcium salts can temporarily relieve symptoms, while excessive secretion of parathyroid glands in hyperparathyroidism can cause bone calcium to enter the blood and enhance renal reabsorption of calcium, while activating the conversion of vitamin D13 into active D3, promoting the absorption of calcium in the small intestine to make blood calcium too high, and inhibiting renal reabsorption of phosphate and promoting the excretion of phosphorus in urine to make blood phosphorus too low, thus leading to calcium This leads to abnormal deposition of calcium salts in tissues, causing pathological calcification of tissues and possible formation of stones, and pathological fractures due to reduced bone calcium.