| Peptic Ulcer Disease | Middle-aged to elderly, M > F | Chronic epigastric pain (often relieved by food or antacids); daily NSAID/aspirin use (including OTC); smoking; H. pylori risk; corticosteroid use | Hematemesis and/or melena; may be painless when on NSAIDs | Prior ulcer or UGIB (60% of recurrent bleeds = same lesion); nocturnal pain waking patient |
| Oesophageal/Gastric Varices | Any age; cirrhotic or chronic liver disease patients | Known cirrhosis, hepatitis B/C, heavy alcohol use; prior variceal bleed (60% re-bleed within 12 months); jaundice, ascites, easy bruising | Sudden, massive hematemesis; often bright red, large volume | 20% mortality per bleed episode; haemodynamic instability; stigmata of chronic liver disease |
| Erosive Esophagitis | Adults with GERD; critically ill patients | Longstanding heartburn / regurgitation; chronic NGT or feeding tube; immunosuppression; anticoagulant use; critically ill/ICU (stress ulceration) | Hematemesis or melena; usually lower volume | Risk factors: cirrhosis (moderate-severe), poor performance status, anticoagulation |
| Erosive Gastritis / Duodenitis | NSAID users; alcohol users; critically ill | Heavy NSAID/aspirin use; heavy alcohol intake; physiological stress (burns, head injury, sepsis); no prodromal epigastric pain (often silent) | Hematemesis (coffee-ground) or melena | May be diffuse, difficult to control endoscopically |
| Mallory-Weiss Tear | Young to middle-aged; alcohol users | Forceful retching/vomiting or coughing immediately before hematemesis; alcohol binge; eating disorder (bulimia); pregnancy (hyperemesis gravidarum) | Hematemesis after forceful vomiting - blood appears after non-bloody vomit initially | Severe bleeding if portal hypertension co-exists; mostly self-limiting (~95%) |
| GI Neoplasm (gastric/oesophageal cancer) | Older adults (>50 years); M > F | Progressive dysphagia; anorexia; unintentional weight loss; early satiety; change in bowel habit; family history of GI cancer | Hematemesis or melena; often slow/insidious; may present as iron-deficiency anaemia | Age >50 with new dyspepsia; dysphagia is an alarm symptom; any palpable abdominal mass |
| Dieulafoy Lesion | Middle-aged to elderly; male predominance | No preceding epigastric symptoms; often no precipitating history; hypertension, cardiovascular disease, renal failure, diabetes; alcohol use | Sudden, massive, intermittent hematemesis without abdominal pain; "herald bleeds" | Recurrent massive bleeds with no identifiable cause on initial endoscopy |
| Angiodysplasia / GAVE | Elderly (>60 years); systemic disease | History of aortic stenosis (Heyde's syndrome), chronic renal failure, hereditary haemorrhagic telangiectasia (HHT/Osler-Weber-Rendu), liver cirrhosis (GAVE) | Chronic occult bleeding or intermittent overt bleeds; melena or iron-deficiency anaemia | Elderly patient with unexplained anaemia; known connective tissue disease |
| Aortoenteric Fistula | Elderly; post-vascular surgery | Previous aortic graft surgery (typically 5+ years ago); pulsatile abdominal mass; "herald bleed" (small initial bleed, then catastrophic haemorrhage) | Massive hematemesis or melena; often preceded by a small sentinel bleed | Prior aortic graft = must exclude AEF; extremely high mortality if missed |
| Haemobilia | Post-procedural / trauma | Recent hepatobiliary surgery, liver biopsy, ERCP, or trauma; RUQ pain + jaundice (Quincke's triad) | Hematemesis or melena; blood in biliary tree | Classic triad: upper GI bleed + RUQ pain + jaundice = haemobilia until proven otherwise |