Each different form of hyperparathyroidism has its own etiologic factors that are grouped together by type :
When the parathyroid glands become overactive and excessively produce parathyroid hormone PTH, which is responsible for the regulation of phosphate and calcium levels in the body, it leads to hyperparathyroidism . Hyperparathyroidism is divided into three forms, primary hyperparathyroidism, secondary hyperparathyroidism, and tertiary hyperparathyroidism.
It should be noted that there are other reasons for the overproduction of PTH. A person could be suffering from a glandular disorder like hyperthyroidism which leads to hypercalcemia, or there could be low calcium levels in the body due to a vitamin D deficiency or a chronic kidney disease.