Primary hyperparathyroidism in 80% of cases is due to a single benign tumor known as a parathyroid adenoma with most of the rest of the cases due to a multiple benign tumors.[1][2] Rarely it may be due to parathyroid cancer.[2] Secondary hyperparathyroidism typically occurs due to vitamin D deficiency, chronic kidney disease, or other causes of low blood calcium.[1] Diagnosis of primary disease is by finding a high blood calcium and high PTH levels.[2]