The normal value of blood calcium is 9mdash;11 milligrams of calcium in 100 milliliters of blood, or 2.2mdash;2.7 millimolar concentration per liter of blood. The normal fluctuation of blood calcium is small, mainly because calcium is extremely important for maintaining many physiological functions in the body. Blood calcium ion testing can determine the likelihood of a variety of diseases. For example, in hyperparathyroidism, blood ionized calcium is higher than the normal range. So what are the causes of the development of high blood calcium ions? The following is an overview. The etiology of high calcium ions in the blood is unknown, and the possible causes are as follows: 1. Head and neck radiation therapy: 10%-30% of hyperparathyroid patients have a history of radiation therapy, and often have thyroid nodule disease. Among them, benign thyroid disease accounts for 20%-50% and malignant lesions for 6%-11%. 2, alcohol abuse 3, drugs: thiazide diuretics, glucocorticoids, thioredoxin, hyperglycemia, etc. can lead to an increase in PTH. 4.Heredity: More than one member of a family may have hyperparathyroidism and some multiple endocrine adenomas (MEN), MENI refers to multiple endocrine adenomas of pituitary, pancreas, parathyroid and adrenal cortex, with a deletion of the q13 allele of the second chromosome pair. genetic defects of chromosomes. Calcium ions in the blood can play a broader and more important role by being transported through the blood to various parts of the body to supply the body’s needs. Therefore, it is recommended that patients should actively seek medical attention at a regular hospital in the event of high calcium ions in the blood to avoid delaying the condition.