5.1 Gastrointestinal Diseases
Key Takeaways
- Visceral GI pain is dull, poorly localized, and midline; parietal peritoneal irritation produces sharp, localized pain that worsens with movement — a key distinction for chiropractic triage
- Right upper quadrant pain with fever and positive Murphy sign supports acute cholecystitis; epigastric pain radiating through to the back with elevated lipase supports acute pancreatitis
- Peptic ulcer disease classically causes epigastric burning relieved by food (duodenal) or worsened by food (gastric); perforation presents with sudden severe pain, rigid abdomen, and free air on imaging
- Inflammatory bowel disease (Crohn disease vs ulcerative colitis) is distinguished by distribution: Crohn can affect any GI segment with skip lesions and fistulae; UC is continuous from the rectum with bloody diarrhea
- GI bleeding red flags — hematemesis, melena, hematochezia with hemodynamic instability, or unexplained anemia in an adult male — require urgent medical referral before any manual therapy
Why Gastrointestinal Disease Matters on Part II
General Diagnosis accounts for 19% of NBCE Part II (255 questions, scaled passing score 375). Within that domain, gastrointestinal disease is a recurring clinical-impression topic because hollow and solid abdominal organs refer pain through shared spinal segments. A patient who reports mid-thoracic, shoulder, or epigastric discomfort may have a gallbladder, pancreatic, or peptic process — not a mechanical spine lesion. Part II vignettes test whether you recognize the visceral pattern, form the correct ranked differential, and refer rather than adjust.
Visceral Versus Parietal Pain: The Foundation
Visceral pain arises from hollow organ distension, ischemia, or smooth-muscle spasm. It is dull, deep, poorly localized, and often midline because bilateral autonomic innervation converges on the spinal cord. Classic examples: early appendicitis (periumbilical), biliary colic (epigastric or RUQ), and early pancreatitis (epigastric). Parietal (somatic) pain occurs when inflammation reaches the peritoneum; it is sharp, well localized, and worsens with movement, coughing, or palpation — the patient "guards" and may lie still. Progression from visceral to parietal pain signals worsening inflammation and is a referral red flag.
| Pain Type | Quality | Localization | Movement Effect | Classic Example |
|---|---|---|---|---|
| Visceral | Dull, cramping | Poor; often midline | Minimal change | Early appendicitis, biliary colic |
| Parietal | Sharp, stabbing | Precise | Worsens with movement | Perforated ulcer, peritonitis |
| Referred | Aching | Remote site (shoulder, back) | Variable | Diaphragmatic irritation (Kehr sign) |
Kehr sign — left shoulder pain from diaphragmatic irritation (splenic rupture, ectopic pregnancy, perforated viscus) — is a high-yield referred-pain pattern.
Upper GI: GERD, Peptic Ulcer Disease, and Bleeding
Gastroesophageal reflux disease (GERD) presents with substernal burning, regurgitation, and symptoms worsened by lying supine or after large meals. It mimics cardiac chest pain; cardiac causes must be excluded when pain is exertional or accompanied by diaphoresis or dyspnea. Peptic ulcer disease (PUD) causes epigastric pain with a timing clue: duodenal ulcers often burn at night and are relieved by food; gastric ulcers may be worsened by food. Both are linked to Helicobacter pylori infection and NSAID use.
Complications drive the clinical impression: bleeding (melena from upper GI, hematochezia if rapid transit), perforation (sudden severe epigastric pain, rigid "board-like" abdomen, absent bowel sounds, pneumoperitoneum on upright chest X-ray), and gastric outlet obstruction (vomiting, succussion splash). Any hemodynamically unstable GI bleed is an emergency — not a chiropractic presentation.
Supporting labs: CBC for anemia; H. pylori testing (urea breath test, stool antigen, or biopsy); stool occult blood for chronic blood loss. Endoscopy is definitive for ulcer diagnosis and malignancy exclusion in patients over 55 with alarm features (weight loss, dysphagia, GI bleeding, anemia).
Hepatobiliary: Cholecystitis, Cholelithiasis, and Hepatitis
Biliary colic from gallstones causes episodic RUQ or epigastric pain, often after fatty meals, lasting under 6 hours, without fever. Acute cholecystitis adds persistent RUQ pain (>6 hours), fever, leukocytosis, and Murphy sign (inspiratory arrest during deep RUQ palpation). Choledocholithiasis with common bile duct obstruction produces jaundice, dark urine, pale stools, and elevated direct bilirubin and alkaline phosphatase.
Acute hepatitis (viral, toxic, autoimmune) presents with fatigue, jaundice, RUQ discomfort, and elevated AST/ALT (often >1,000 U/L in acute viral hepatitis). Chronic hepatitis/cirrhosis shows fatigue, ascites, spider angiomata, palmar erythema, gynecomastia, and caput medusae; labs reveal prolonged PT/INR, low albumin, and thrombocytopenia from portal hypertension.
| Condition | Key History | Key Exam | Key Labs/Imaging |
|---|---|---|---|
| Biliary colic | Post-fatty meal, episodic RUQ pain | Benign abdomen between attacks | RUQ ultrasound: stones |
| Acute cholecystitis | Persistent RUQ pain, fever | Murphy sign positive | US: gallbladder wall thickening, pericholecystic fluid |
| Acute hepatitis | Jaundice, recent travel/IV drugs | Hepatomegaly, jaundice | AST/ALT markedly elevated |
| Pancreatitis | Epigastric → back, alcohol or gallstones | Epigastric tenderness | Lipase/amylase elevated; CT if severe |
Pancreatitis and Lower GI Emergencies
Acute pancreatitis causes severe epigastric pain radiating to the back, nausea/vomiting, and relief by leaning forward. Lipase is more specific than amylase and remains elevated longer. Causes: gallstones (most common), alcohol, hypertriglyceridemia, ERCP, medications. Hemorrhagic pancreatitis (Grey Turner sign — flank ecchymosis; Cullen sign — periumbilical ecchymosis) is life-threatening.
Appendicitis classically migrates from periumbilical visceral pain to RLQ parietal pain (McBurney point), with anorexia, nausea, low-grade fever, and RLQ tenderness with guarding. Rovsing sign (RLQ pain with LLQ palpation) and psoas sign (pain with hip extension) support the impression. Atypical presentations occur in pregnancy, the elderly, and retrocecal appendix.
Inflammatory bowel disease (IBD): Ulcerative colitis — continuous inflammation from rectum, bloody diarrhea, tenesmus, increased colon cancer risk. Crohn disease — any GI segment, skip lesions, transmural inflammation, fistulae, abscesses, malabsorption; perianal disease is common. Both may present with extraintestinal manifestations (uveitis, arthritis, erythema nodosum).
Irritable bowel syndrome (IBS) is a diagnosis of exclusion: chronic abdominal pain with altered bowel habits, no alarm features, normal labs, and Rome criteria. It is not an inflammatory process — distinguishing IBS from IBD is a board favorite.
Referral Red Flags and Chiropractic Triage
Refer urgently (or to the emergency department) when any of the following appear:
- Sudden severe abdominal pain with rigidity or rebound tenderness (perforation, peritonitis)
- GI bleeding (hematemesis, melena, brisk hematochezia) or syncope with abdominal symptoms
- Persistent vomiting, especially with bilious or feculent emesis (obstruction)
- Jaundice with fever and RUQ pain (cholangitis — Charcot triad: fever, jaundice, RUQ pain)
- Unintentional weight loss, progressive dysphagia, or new-onset symptoms after age 50
- Known cirrhosis with confusion (hepatic encephalopathy) or ascites
A patient with mechanical low back pain and no visceral qualifiers is appropriate for chiropractic evaluation. The same patient with fever, GI symptoms, or pain that does not change with position warrants a medical workup first.
Exam Tip
When a vignette pairs abdominal organ pathology with a musculoskeletal complaint, list the visceral diagnosis first if the stem includes fever, GI symptoms, jaundice, or pain independent of spine movement. Part II rewards pattern recognition over adjusting the wrong structure.
A 45-year-old woman has 12 hours of persistent right upper quadrant pain, fever, and inspiratory arrest during deep palpation beneath the right costal margin. Which clinical impression is most supported?
A 38-year-old man presents with severe epigastric pain radiating to his back, nausea, and relief when leaning forward. Lipase is markedly elevated. The most likely diagnosis is:
Which feature best distinguishes ulcerative colitis from Crohn disease on NBCE Part II?
A patient with duodenal peptic ulcer disease typically reports epigastric pain that: