Hypercalcaemia with suppressed parathyroid hormone (PTH) typically raises concern for malignancy-related, granulomatous disorder-related or drug-related hypercalcaemia but can occasionally be caused by less common conditions. We present the case of a middle-aged female with hypercalcaemia with reduced PTH levels despite vitamin insufficiency, who was eventually diagnosed with autoimmune hyperthyroidism. The diagnostic challenge arose from the atypical association of hyperthyroidism and hypercalcaemia.
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