Symptoms of hypocalcaemia were more common in patients with Graves’ disease (p < 0.001; OR 95% CI 3.26;1.48–7.14), but the frequency of biochemical hypocalcaemia, postoperative levels of parathyroid hormone (PTH), and treatment with calcium and vitamin D did not differ between groups of patients [22]. The gene discussed is PTH; the disease is Hypocalcemia.