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A 34-year-old female presented to our hospital due to the progressive enlargement of thyroid nodules, accompanied by mild discomfort, difficulty swallowing and iron deficiency anaemia. Physical examination demonstrated an increased head circumference of 60 cm and three papules on the hands. Laboratory tests showed haemoglobin of 90 g/L (reference range: 115–150 g/L), ferritin of 1.9 ng/mL (reference range: 11–306.8 ng/mL) and no significant abnormality in routine stool tests or tumour markers. Helicobacter pylori testing was negative. Enhanced CT scans showed thickening of the gastric wall with uneven enhancement. Furthermore, gastroscopy revealed diffuse polypoid elevations throughout the stomach (figure 1A, B). Pathology indicated inflammatory polyps (figure 1C). Colonoscopy showed scattered polypoid elevations in the rectum and sigmoid colon (figure 2A) and diffuse polypoid elevations in the terminal ileum (figure 2B). Pathology indicated chronic inflammation of the mucosa accompanied by lymphoid tissue hyperplasia (figure 2C).