This article presents the case of a 65-year-old man who was admitted to hospital due to persistent diarrhoea and unintentional weight loss. During the initial diagnosis, ultrasound examination revealed numerous liver metastases, the most common causes of which are colon, lung, and breast cancers. However, in the presented case, further diagnostics revealed a highly malignant duodenal neuroendocrine tumour. Two years earlier, primary hyperparathyroidism was diagnosed, but this problem was neglected by the patient. The mentioned diseases can be a clinical manifestation of multiple endocrine neoplasia type 1 syndrome. Unfortunately, the patient died before the final diagnosis. The daughter of the patient was also encouraged to check for the disease. Extraordinarily, she was totally uninterested. Denial about terminal cancer and disregard of its consequences is a palliative issue affecting not only patients but also their families.