- Is the patient vegan or vegetarian, or otherwise anorexic with poor food intake?
- Is there a personal or family history of autoimmune disorders?
- Is there a history/symptoms of glossitis or mouth ulceration?
- Is there a history of neurological symptoms, for example parasthesias or unsteady gate?
- Is there a history/symptoms of malabsorption or chronic pancreatitis?
- Is there a history of stomach surgery, bariatric surgery or small bowel resection?
- Does the patient take metformin or proton pump inhibitor?
Learn more here.