A 71 yo woman with primary hyperparathyroidism awaiting surgery because of significant hypercalcemia and hypercalciuria presented to the local emergency department with the chief complaints of discomfort in her neck, sore throat, and difficulty swallowing. She was found to be hypocalcemic with a calcium level of 8.1 mg/dL. She was seen by her endocrinologist three days later at which time serum calcium, iPTH, and serum phosphate levels were all within normal limits. Based on history and a series of ultrasounds the patient was diagnosed with spontaneous infarction of her parathyroid adenoma, which resulted in resolution of her primary hyperparathyroidism.