The document discusses primary hyperparathyroidism, which is caused by elevated levels of parathyroid hormone due to a parathyroid adenoma. It causes high blood calcium levels, excessive calcium in the urine, and thinning of the bones. Diagnosis involves testing serum calcium and PTH levels, as well as parathyroid scans and ultrasounds. Treatment is removal of the parathyroid adenoma through a mini-incision parathyroidectomy guided by preoperative localization tests to reduce risks and improve outcomes. Aberrant adenoma locations and multiple adenomas can complicate the surgery.