12.3 Gastrointestinal and Hepatobiliary Conditions
Key Takeaways
Appendicitis classically begins as dull periumbilical pain that settles at McBurney's point, with anorexia and positive Rovsing's, psoas, or obturator signs; it is a surgical emergency.
Cholecystitis causes right-upper-quadrant pain after fatty meals with a positive Murphy's sign; pancreatitis causes epigastric pain radiating to the back; both need medical care.
Gastric ulcer pain worsens with food, while duodenal ulcer pain is eased by food; board-like rigidity means perforation.
Crohn's disease is transmural with skip lesions anywhere from mouth to anus; ulcerative colitis is continuous mucosal inflammation from the rectum upward.
IBS is a diagnosis of exclusion; new symptoms after age 50, bleeding, weight loss, or night symptoms need medical work-up, and colorectal screening starts at age 45.
12.3 Gastrointestinal and Hepatobiliary Conditions
Quick Answer: Abdominal, urological, and metabolic complaints are ubiquitous in outpatient acupuncture practice. The practitioner must possess sharp diagnostic instincts to separate chronic functional disharmonies from surgical emergencies and acute endocrine decompensation. Acute appendicitis manifests as dull visceral periumbilical pain shifting over 12–24 hours to sharp somatic pain at McBurney's point (RLQ), accompanied by anorexia, Rovsing's sign, and the Psoas sign; this is an absolute surgical emergency. Acute cholecystitis produces severe Right Upper Quadrant (RUQ) pain radiating to the right scapula, triggered by fatty meals, with an inspiratory arrest on deep palpation (Murphy's sign). Peptic ulcer perforation triggers sudden, excruciating generalized pain with "board-like" abdominal wall rigidity. Renal, urinary, endocrine, and metabolic conditions follow in Section 12.4.
Gastrointestinal Pathologies and the Acute Surgical Abdomen
The "acute abdomen" denotes sudden, non-traumatic, severe abdominal pain requiring rapid decision-making regarding emergency surgical laparotomy or laparoscopy.
+-----------------------------------------------------------------------------+
| ABDOMINAL PAIN QUADRANT MATRIX |
+-----------------------------------------------------------------------------+
| RIGHT UPPER QUADRANT (RUQ) | LEFT UPPER QUADRANT (LUQ) |
| * Acute Cholecystitis / Cholelithiasis| * Splenic Rupture / Infarction |
| * Acute Hepatitis / Hepatic Abscess | * Acute Pancreatitis (radiates back)|
| * Duodenal Ulcer Perforation | * Gastric Ulcer / Gastritis |
| * Fitz-Hugh-Curtis Syndrome (PID) | * Left Lower Lobe Pneumonia |
+--------------------------------------+--------------------------------------+
| RIGHT LOWER QUADRANT (RLQ) | LEFT LOWER QUADRANT (LLQ) |
| * Acute Appendicitis (McBurney) | * Acute Diverticulitis (sigmoid) |
| * Cecal Diverticulitis / Crohn's | * Ulcerative Colitis |
| * Ectopic Pregnancy / Ovarian Torsion| * Ectopic Pregnancy / Ovarian Torsion|
| * Nephrolithiasis (ureteral colic) | * Nephrolithiasis (ureteral colic) |
+-----------------------------------------------------------------------------+
Acute Appendicitis: Pathophysiology and Physical Examination Signs
- Pathophysiology: Obstruction of the appendiceal lumen by a fecalith (calcified fecal stone, in adults) or lymphoid hyperplasia (following viral infections, in children/adolescents). Continued mucosal mucus secretion elevates intraluminal pressure, collapsing venous outflow, inducing tissue ischemia, and permitting transmural bacterial invasion (Bacteroides fragilis, E. coli), culminating in gangrene and perforation within 24 to 36 hours.
- Pain Migration Mechanics:
- Early Phase (Visceral Pain): Luminal distension stimulates autonomic visceral afferent stretch fibers entering the spinal cord at the T10 dermatomal level. The patient experiences dull, vague, crampy, poorly localized discomfort centered around the umbilicus (periumbilical) or epigastrium.
- Late Phase (Somatic Parietal Pain): As transmural inflammation contacts the richly innervated somatic parietal peritoneum of the right iliac fossa (12–24 hours later), pain shifts and localizes sharply to the Right Lower Quadrant (RLQ) at McBurney's point (located precisely one-third of the distance from the anterior superior iliac spine [ASIS] to the umbilicus).
- Constitutional Symptoms: Anorexia (the "hamburger sign"—patient refuses their favorite food; almost universally present), nausea, vomiting (characteristically occurring after the onset of pain, distinguishing surgical appendicitis from viral gastroenteritis where vomiting precedes pain), low-grade fever (37.5°C–38.5°C / 99.5°F–101.3°F; high fever > 39°C suggests frank perforation).
- Classical Physical Examination Signs:
| Examination Sign | Execution Technique | Anatomical Mechanism & Clinical Significance |
|---|---|---|
| McBurney's Sign | Deep manual palpation over McBurney's point (one-third distance from ASIS to umbilicus). | Maximal localized somatic tenderness directly over the inflamed appendiceal body. |
| Rovsing's Sign | Deep, sustained manual palpation in the Left Lower Quadrant (LLQ). | Elicits referred sharp pain in the Right Lower Quadrant (RLQ). Mechanical compression shifts colon gas retrogradely into the cecum and stretches inflamed parietal peritoneum. |
| Psoas Sign | With the patient in the left lateral decubitus position, the examiner passively extends the right hip (or has supine patient flex right hip against resistance). | Elicits sharp RLQ pain. Indicates an inflamed retrocecal appendix resting directly upon the belly of the iliopsoas muscle. |
| Obturator Sign | With patient supine, flex the right hip and knee to 90 degrees; examiner passively internally rotates the hip. | Elicits sharp hypogastric / RLQ pain. Indicates an inflamed pelvic appendix abutting the fascia of the obturator internus muscle. |
| Blumberg's Sign | Deep, gentle compression of the RLQ followed by rapid, sudden release of the examining hands. | Rebound tenderness. Sharp exacerbation of pain upon release indicates generalized parietal peritoneal inflammation. |
| Dunphy's Sign | Instruct the patient to perform a vigorous cough. | Sharp localization of localized pain to the RLQ triggered by coughing. Highly sensitive for peritoneal irritation. |
Caution
Appendiceal Perforation: If a patient with severe appendicitis experiences sudden, dramatic relief of pain, followed hours later by diffuse, high-fever peritonitis, the appendix has ruptured. Immediate emergency department transfer is mandatory. Keep the patient strictly NPO (nothing by mouth) and do not administer laxatives or enemas.
Acute Cholecystitis and Biliary Colic
- Pathophysiology: Cholelithiasis (gallstones, composed of cholesterol [80%] or pigmented bilirubin) impacts the cystic duct. Bile stasis triggers acute chemical inflammation of the gallbladder mucosa, followed in 50–80% of cases by secondary bacterial infection (E. coli, Klebsiella, Enterococcus).
- Clinical Presentation: Severe, steady, aching or cramping pain located in the Right Upper Quadrant (RUQ) or epigastrium. The pain characteristically develops 30 to 90 minutes following the consumption of a fatty, greasy, or fried meal (which stimulates duodenal cholecystokinin [CCK] release, prompting forceful gallbladder contraction against the obstructed cystic duct). Discomfort typically lasts > 4 to 6 hours (distinguishing persistent acute cholecystitis from transient biliary colic, which resolves within 2–4 hours).
- Referred Pain Pathways: Inflammation irritating the subdiaphragmatic parietal peritoneum stimulates afferent branches of the phrenic nerve (C3, C4, C5), producing referred somatic pain to the right shoulder tip and neck. Afferent visceral splanchnic fibers transmit pain through T7–T9 sympathetic ganglia, producing referred pain to the right infrascapular region and interscapular back.
- Murphy's Sign: The examiner palpates deeply under the right costal margin at the midclavicular line while the patient takes a slow, deep inspiration. As the descending diaphragm drives the inflamed gallbladder against the examiner's fingers, the patient experiences a sudden, sharp stab of pain and abruptly catches or halts their breath (inspiratory arrest). A positive Murphy's sign carries high specificity for acute cholecystitis. Ultrasound is the diagnostic imaging of choice.
Peptic Ulcer Disease (PUD): Gastric vs. Duodenal & Perforation
Peptic ulcer disease represents mucosal excoriation extending through the muscularis mucosae of the stomach or proximal duodenum, driven by Helicobacter pylori infection (> 70–85%) and chronic nonsteroidal anti-inflammatory drug (NSAID) use. H. pylori was originally named Campylobacter pylori, which is why the outline lists Campylobacter with peptic ulcer; Campylobacter jejuni itself is a common cause of foodborne diarrhea (Section 12.10).
+-----------------------------------------------------------------------------+
| GASTRIC VS. DUODENAL ULCER DIFFERENTIATION |
+-----------------------------------------------------------------------------+
| Parameter | Gastric Ulcer | Duodenal Ulcer |
+------------------+------------------------------------+---------------------+
| Peak Age | Older adults (55-70 years) | Younger (30-55 yrs) |
| Acid Secretion | Normal to decreased acid secretion | Increased acid out |
| Pain Timing | Immediately / 30 min post-meal | 2-3 hours post-meal |
| Food Effect | Food WORSENS pain | Food RELIEVES pain |
| Nocturnal Pain | Uncommon | Common (11 PM-2 AM) |
| Weight Trend | Weight LOSS (food avoidance) | Weight GAIN (eats) |
| Malignancy Risk | Higher (biopsy required) | Virtually never |
+-----------------------------------------------------------------------------+
- Acute Visceral Perforation: An ulcer erodes completely through the gastric or duodenal wall, spilling hydrochloric acid, pepsin, bile, and enteric bacteria into the peritoneal cavity.
- Clinical Presentation: Sudden, abrupt, explosive onset of agonizing, knife-like epigastric pain that rapidly diffuses across the entire abdomen.
- Physical Examination: "Board-like" abdominal rigidity (intense, involuntary reflex contracture of the rectus abdominis muscles that cannot be voluntarily relaxed), extreme rebound tenderness, absence of bowel sounds (paralytic ileus), shallow tachypneic breathing, and subdiaphragmatic free air (pneumoperitoneum) visible beneath the diaphragmatic domes on upright chest radiography. Immediate surgical emergency!
- Upper Gastrointestinal Hemorrhage: Erosion into the gastroduodenal artery branches produces hematemesis (vomiting of bright red blood), "coffee-ground" emesis (blood oxidized by gastric acid to brown hematin), or melena (black, tarry, highly foul-smelling stools containing digested blood from upper GI bleeding). Patients exhibiting orthostatic tachycardia (pulse increase > 20 bpm upon standing) or hypotension have lost > 15–20% of circulating blood volume and require immediate emergency transport.
Inflammatory Bowel Disease (IBD): Crohn's Disease vs. Ulcerative Colitis
| Pathological Feature | Crohn's Disease (Regional Enteritis) | Ulcerative Colitis (UC) |
|---|---|---|
| Anatomical Distribution | Any part of the GI tract from mouth to anus ("gum to bum"). Most common site: terminal ileum and cecum. Characterized by discontinuous "skip lesions" with normal intervening bowel. | Confined strictly to the colon and rectum. Always involves the rectum and spreads continuously and proximally without skip lesions. |
| Depth of Inflammation | Transmural (full thickness of the bowel wall: mucosa, submucosa, muscularis, and serosa). | Mucosal and submucosal only (superficial involvement sparing the muscularis and serosa). |
| Gross Morphology | "Cobblestone" mucosal appearance, deep linear ulcerations, bowel wall thickening, and "creeping fat" on mesenteric serosa. | Diffuse erythema, granular friable mucosa, superficial mucosal ulcers, and inflammatory pseudopolyps. |
| Histopathology | Non-caseating granulomas (~50% of biopsies); lymphoid aggregates. | Crypt abscesses and crypt architectural distortion; no granulomas. |
| Clinical Hallmarks | Chronic crampy abdominal pain (often RLQ), non-bloody or intermittently bloody diarrhea, malabsorption (vitamin B12 deficiency, weight loss, aphthous oral ulcers). | Recurrent bloody diarrhea with mucus, rectal tenesmus (painful, constant urge to defecate), and lower abdominal cramping relieved by defecation. |
| Primary Complications | Fistulae (enterocutaneous, enterovesical, enteroenteric), bowel strictures / mechanical obstructions, perianal abscesses/fissures. | Toxic megacolon (acute non-obstructive colonic dilation > 6 cm with systemic toxicity/shock), massive hemorrhage, high lifetime risk of colorectal carcinoma. |
Intestinal Obstruction
- Etiology: Small Bowel Obstruction (SBO) is caused predominantly by postoperative intra-abdominal adhesions (> 60%), followed by incarcerated hernias and neoplasms. Large Bowel Obstruction (LBO) is caused predominantly by colorectal adenocarcinoma (> 60%), sigmoid or cecal volvulus, and diverticular strictures.
- Cardinal Manifestations: (1) Cramping, colicky, periumbilical pain; (2) Nausea and profuse vomiting (early and bilious in proximal SBO; late, feculent, and foul-smelling in distal SBO or LBO); (3) Marked abdominal distension; and (4) Obstipation (complete failure to pass both stool and flatus).
- Auscultation Dynamics: Early in mechanical obstruction, auscultation reveals hyperactive, high-pitched, musical, "tinkling" bowel sounds with audible peristaltic rushes as the bowel hyper-contracts against the blockage. Late in obstruction, or when bowel ischemia/strangulation develops, the abdomen becomes completely silent.
Other Gastrointestinal Conditions on the 2026 Outline
| Condition | Key features | Referral and practice notes |
|---|---|---|
| GERD | Heartburn and regurgitation, worse after meals and lying down | Red flags for endoscopy: difficulty swallowing, weight loss, GI bleeding, anemia, new onset after age 60 |
| Gastritis | Epigastric burning or nausea; caused by NSAIDs, alcohol, or H. pylori | Black stools or vomiting blood mean bleeding and need emergency care |
| Hiatal hernia | Part of the stomach slides above the diaphragm; causes reflux symptoms | Large hernias may cause chest fullness after meals; rule out cardiac causes of chest pain |
| Celiac disease | Autoimmune reaction to gluten: diarrhea, bloating, weight loss, iron-deficiency anemia, an itchy blistering rash (dermatitis herpetiformis) | Testing (tissue transglutaminase IgA) must be done while the patient is still eating gluten |
| Lactose intolerance | Bloating, gas, and diarrhea after dairy | Benign; distinguish from celiac disease and IBD |
| Irritable bowel syndrome (IBS) | Rome IV: recurrent abdominal pain at least 1 day a week for 3 months, linked to bowel movements or changes in stool frequency or form | Diagnosis of exclusion: new onset after 50, bleeding, weight loss, night symptoms, or a family history of colon cancer need medical work-up |
| Diverticular disease | Diverticulosis is usually silent; diverticulitis causes left-lower-quadrant pain, fever, and tenderness | Diverticulitis needs prompt medical care; peritoneal signs mean emergency |
| Pancreatitis | Severe epigastric pain radiating to the back, nausea, and vomiting, often from gallstones or alcohol | Emergency referral |
| Hepatitis | Jaundice, dark urine, fatigue, right-upper-quadrant pain, raised ALT and AST. Hepatitis A is fecal-oral; B and C are bloodborne | Vaccines exist for A and B; hepatitis C is curable with antiviral therapy. Practice strict bloodborne-pathogen precautions |
| Cirrhosis | Jaundice, ascites, spider angiomas, palmar erythema, easy bruising, confusion | Low platelets and a high INR raise bleeding risk with needling; confusion may mean hepatic encephalopathy |
| Hemorrhoids | Bright red blood on the paper; internal hemorrhoids are painless, thrombosed external ones painful | Rectal bleeding in adults should be evaluated to exclude colorectal cancer |
| GI polyps | Usually silent; adenomatous polyps can become cancer | USPSTF recommends colorectal cancer screening from age 45 to 75 |
| Gastric bypass | Dumping syndrome (cramps, diarrhea, and racing heart soon after sugary meals; low blood sugar 1-3 hours later) and deficiencies of B12, iron, calcium, vitamin D, and thiamine | Avoid recommending NSAIDs (risk of ulcers at the surgical join) |
| SIBO | Small intestinal bacterial overgrowth: bloating, diarrhea, and malabsorption, often after surgery, with motility disorders, or with long-term acid suppression | Diagnosed with breath testing and treated with antibiotics |
| Peritonitis and biliary obstruction | Peritonitis: rigid abdomen, rebound tenderness, fever. Biliary obstruction: jaundice, pale stools, dark urine, itching; with fever and RUQ pain (Charcot's triad) it suggests cholangitis | Both are emergencies |
A 24-year-old female presents to an outpatient clinic with a 14-hour history of abdominal discomfort that began as a dull ache around her umbilicus and has now localized as sharp, severe pain in her right lower quadrant. She reports no appetite, has vomited once, and has a low-grade temperature of 100.2°F (37.9°C). Deep palpation in the left lower quadrant causes distinct pain in her right lower quadrant, and passive extension of her right hip while lying on her left side markedly intensifies the pain. Which clinical assessment and examination signs are described?
Acute cholecystitis with positive Murphy's and Blumberg's signs
Acute appendicitis with positive Rovsing's and Psoas signs
Perforated peptic ulcer with positive Dunphy's and McBurney's signs
Crohn's disease exacerbation with positive Obturator and Carnett's signs
A 49-year-old male with a history of severe knee osteoarthritis managed with daily over-the-counter ibuprofen presents complaining of recurring epigastric burning pain. He notes that the pain consistently worsens immediately after eating meals, causing him to avoid food and lose 12 pounds over the past two months. This morning he experienced sudden, agonizing, knife-like epigastric pain that rapidly became generalized. Physical examination reveals an involuntary, rigid, 'board-like' abdominal wall and complete absence of bowel sounds. What is the primary underlying lesion and its acute complication?
Duodenal ulcer complicated by lower gastrointestinal hematochezia
Acute cholecystitis complicated by gallstone pancreatitis
Ulcerative colitis complicated by acute toxic megacolon
Gastric ulcer complicated by acute visceral perforation and chemical peritonitis
A patient with recurrent bloating and loose stools is told by a friend to stop eating gluten before seeing a physician about possible celiac disease. Why is this advice a problem?
A gluten-free diet causes iron-deficiency anemia, so testing should wait until iron levels are checked first
Celiac disease is diagnosed only by stool culture, which is unaffected by diet changes
Tests and biopsy can turn falsely negative off gluten, so test while gluten is still being eaten
Removing gluten immediately causes dermatitis herpetiformis, which would hide the diagnosis
Sections you finish are checked off in the contents.