Based on a popular well known Christmas carol this episode reminds us about prescribing thoughtfully, recognising key red flags, and keeping often-missed diagnoses like bile acid diarrhoea, coeliac disease and liver disease on the radar. The episode also reinforces the importance of early-life microbiome influences and structured differential diagnosis for abdominal symptoms in primary care. Prescribing and de-prescribing • Taper PPIs rather than stopping abruptly to avoid rebound acid hypersecretion, driven by upregulated gastrin during PPI therapy. • Always link NSAID use and H. pylori status to ulcer risk, and remember: gastric ulcers typically cause pain with meals, duodenal ulcers 2–3 hours after eating. Diagnosis, tests and red flags • Use three coeliac test “groups”: serology (tTG/EMA, with total IgA checked), genetics (HLA‑DQ2/DQ8) and duodenal biopsies; ensure patients eat gluten for at least six weeks pre‑testing and to endoscopy. • Actively screen for GI red flags: dysphagia and weight loss (upper GI), PR bleeding and unexplained iron‑deficiency anaemia (lower GI), and escalate for urgent investigation. Practical tools and endoscopy indications • Use the Bristol Stool Chart (types 1–7) routinely in consultations to standardise conversations about stool form and avoid ambiguous “food analogies.” • Remember the three main indications for endoscopy: diagnostic (e.g. dyspepsia, chronic diarrhoea), surveillance (Barrett’s, polyp follow‑up) and therapeutic (RFA/EMR in Barrett’s, polyp removal). Conditions to consider and not miss • Keep bile acid diarrhoea prominent in the differential for IBS‑D: up to ~40% of IBS‑D patients may have it, particularly with ileal disease/resection, Crohn’s, or post‑cholecystectomy. • Maintain a broad GI bleeding differential beyond cancer (e.g. gastritis, peptic ulcer, Mallory–Weiss tear, haemorrhoids/fissures, liver disease/coagulopathy, IBD, angiodysplasia, diverticular disease). Liver disease, microbiome and early life • Remember major causes of liver failure in primary care: excess alcohol, paracetamol overdose, DILI, autoimmune hepatitis, Wilson’s disease, haemochromatosis, viral hepatitis B/C and progressive MASLD. • Support breastfeeding where possible to promote a healthy infant microbiome (HMOs favouring bifidobacteria) and recognise how birth mode and early microbes shape immune development and later allergy/immune risk. Structuring abdominal symptom assessment • For undifferentiated abdominal symptoms, consciously work through a core list: IBS, lactose intolerance, coeliac disease, gastroenteritis, SIBO, IBD, diverticular disease, colorectal cancer, peptic ulcer disease, gallstones/biliary colic, pancreatic insufficiency and medication‑related causes (e.g. metformin, NSAIDs, antibiotics). • Use these categories to guide targeted history, examination, basic tests and thresholds for referral back to gastroenterology or specialist services. Chapters (00:00:04) - The 12 Days of Gutmas(00:01:04) - PPIs(00:02:19) - How to manage gastric and duodenal ulcers on(00:03:40) - Celiac disease tests 6, Interventions(00:05:33) - GI red flags on Christmas Day(00:07:48) - The main indications for endoscopy(00:09:07) - 7 causes of liver failure on Christmas Day(00:10:17) - Healthy gut microbiome 8 days after Christmas(00:12:03) - Bile acid diarrhea(00:13:52) - 10 causes of abnormal gastrointestinal bleeding(00:15:34) - The microbiome of the body(00:17:55) - 12 causes of abdominal dysrhythmia(00:19:59) - 12 Days of Gutmas