A 32-year-old female was seen in emergency department for abdominal pain, nausea and diarrhea. Her serum calcium was found to be elevated at 2.94 mmol/L (normal 2.15-2.55 mmol/L). She was treated with intravenous fluids. Her calcium improved to 2.65 mmol/L and she was discharged home to care for her 6-year-old son. She was referred urgently to an outpatient clinic to investigate her elevated calcium. She was also prescribed pantoprazole for worsening heartburn. In the clinic, Ms. Parapan reported a 2-year history of abdominal pain that was getting worse over time. The pantoprazole she was prescribed was modestly helpful in easing her heartburn and abdominal pain. She denied symptoms of polyuria, polydipsia, confusion or mood changes. There is no history of kidney stones. She had a fracture of her humerus at age 15 due to a ski accident. She was taking pantoprazole and a multivitamin daily. Ms. Parapan’s family history is significant for a father who had a pancreatic tumour, though she does not know any more details about his condition. Both her sister and her paternal aunt had a parathyroidectomy. The same aunt had a pituitary tumour requiring surgery.