Protrusion of abdominal contents through a fascial defect — risk stratified by reducibility, incarceration, and strangulation.
Also known as: hernia, inguinal hernia, hiatal hernia, umbilical hernia, femoral hernia, ventral hernia, incisional hernia
Overview
Protrusion of an organ or tissue through an abnormal opening in the abdominal wall or diaphragm. Classified by location (inguinal, femoral, umbilical, ventral/incisional, hiatal) and by clinical status: reducible, incarcerated (irreducible), or strangulated (compromised blood supply).
Epidemiology
Inguinal hernias are the most common, with lifetime risk of about 27% in men and 3% in women; indirect inguinal hernias predominate in both sexes. Femoral hernias are more common in women and disproportionately present with strangulation. Hiatal hernias are extremely prevalent with age and obesity. Umbilical hernias affect roughly 10-30% of infants and adults with cirrhosis or pregnancy.
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Question 1GastrointestinalMedium
A 66-year-old man with obesity and a chronic smoker's cough presents with a bulge in his right groin that appears when he coughs or lifts and disappears when he lies down. It is nontender and easily reducible, and he denies nausea, vomiting, or obstipation. Exam reveals a soft reducible mass superior to the inguinal ligament that transmits an impulse with cough. Which of the following is the most likely diagnosis?
AInguinal hernia
BFemoral hernia
CSpigelian hernia
DSaphenous varix
Reveal answer & full explanation
Correct answer: A — Inguinal hernia
AInguinal hernia✓
BFemoral hernia
CSpigelian hernia
DSaphenous varix
Why Inguinal hernia is correct
This is an abdominal wall (inguinal) hernia.
A hernia develops when abdominal contents push through a fascial defect under sustained pressure; chronic cough and obesity both chronically raise intra-abdominal pressure, and advancing age weakens the fascia, stacking the key risk factors.
The reducible, cough-impulse-positive bulge located above and medial to the inguinal ligament that appears with straining and disappears when supine is the textbook description of an inguinal hernia, making it correct.
Why the others are wrong
Femoral hernia — presents as a mass inferolateral to the pubic tubercle and below the inguinal ligament, is more common in women, and has a higher incarceration risk; the location described here is inguinal, not femoral.
Spigelian hernia — protrudes through the semilunar line at the lateral border of the rectus sheath, typically near or below the level of the umbilicus rather than in the groin, so it does not produce a bulge just above the inguinal ligament.
Saphenous varix — a dilated saphenous vein that has a cough impulse but is soft, bluish, disappears on lying flat, and is located at the saphenofemoral junction; the reducible bulge protruding through a fascial ring here is a hernia.
Question 2GastrointestinalMedium
A 58-year-old man returns to clinic with a soft, reducible midline bulge at the site of an open colectomy scar from 2 years ago. The bulge enlarges when he coughs or stands and disappears when he lies flat. His history includes a 30-pack-year smoking habit, a BMI of 31, and occasional constipation. Examination confirms a fascial defect with a cough impulse beneath the healed laparotomy incision. Which of the following is the strongest risk factor for this condition?
ALong-term constipation
BPrior abdominal surgery
CElevated body mass index
DHeavy cigarette smoking
Reveal answer & full explanation
Correct answer: B — Prior abdominal surgery
ALong-term constipation
BPrior abdominal surgery✓
CElevated body mass index
DHeavy cigarette smoking
Why Prior abdominal surgery is correct
This is an incisional (ventral) hernia, and the single strongest risk factor for an incisional hernia is the prior laparotomy itself — the surgical incision creates a fascial defect through which contents protrude.
A midline open incision disrupts the linea alba; incisional hernias complicate roughly 10-20% of laparotomies, far exceeding the contribution of any individual systemic factor.
The bulge directly under the colectomy scar with a palpable cough impulse and fascial defect localizes the cause to the surgical wound.
Why the others are wrong
Long-term constipation raises intra-abdominal pressure and contributes to hernia formation generally, but it is a weaker, modifiable cofactor rather than the dominant driver here.
Heavy cigarette smoking impairs collagen synthesis and wound healing and increases recurrence risk, but it potentiates the defect rather than creating it; it is a secondary contributor.
Elevated body mass index increases tension on the closure and is a recognized risk factor (especially for hiatal and ventral hernias), but it ranks below the incision itself as the proximate cause.
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Smoking and malnutrition (impair collagen and wound healing)
Male sex, age, family history (inguinal)
Pathophysiology
A combination of congenital patency (e.g., processus vaginalis for indirect inguinal) and acquired fascial weakness allows abdominal contents to herniate through anatomic defects. Indirect inguinal hernias pass through the deep inguinal ring lateral to the inferior epigastric vessels; direct hernias bulge through Hesselbach triangle medial to those vessels. Femoral hernias descend through the femoral canal medial to the femoral vein. Hiatal hernias involve cephalad migration of the gastroesophageal junction (sliding, type I) or herniation of the fundus alongside (paraesophageal, types II-IV). Incarceration occurs when bowel cannot be reduced; strangulation follows when venous and then arterial supply are compromised, producing ischemia and necrosis.
Clinical presentation
Symptoms
Bulge that enlarges with standing, coughing, or straining and reduces with recumbency (reducible)
Dragging or burning discomfort, worse at end of day
Acute severe pain, nausea/vomiting, irreducibility → incarceration or strangulation
Hiatal: heartburn, regurgitation, dysphagia; large paraesophageal may cause postprandial chest pain or early satiety
Signs / physical exam
Palpable cough impulse at the inguinal canal, umbilicus, or incisional scar
Femoral hernia: mass below and lateral to pubic tubercle
Hiatal: retrocardiac air-fluid level on CXR with large paraesophageal hernia
Classic findings
Femoral hernias most likely to present strangulated due to narrow rigid neck. Pediatric inguinal hernias are almost always indirect and require repair due to high incarceration risk.
Differential diagnosis
Inguinal lymphadenopathy — Firm, nontender to tender nodes without cough impulse; no reducibility
Hydrocele / varicocele — Transilluminates (hydrocele) or bag-of-worms (varicocele); does not extend into the inguinal canal above
Femoral artery aneurysm or pseudoaneurysm — Pulsatile, expansile mass below the inguinal ligament, often post-catheterization
Lipoma of the cord — Soft, nonreducible mass that can be hard to distinguish without imaging or surgery
Testicular torsion (in infants with inguinal swelling) — Acute pain, high-riding testis, absent cremasteric reflex; surgical emergency
GERD without hiatal hernia — Symptoms without anatomic herniation on endoscopy or barium
Rectus diastasis (vs ventral hernia) — Midline ridge with Valsalva but no true fascial defect; no risk of strangulation
Diagnostic workup
Diagnostic criteria
Clinical bulge with cough impulse that disappears with recumbency in a typical location is diagnostic. Strangulation is a clinical diagnosis supported by tenderness, systemic signs, and imaging evidence of bowel ischemia or obstruction.
Labs
CBC, BMP, lactate if strangulation suspected
Type and screen prior to operative repair
Imaging
Diagnosis is usually clinical; imaging reserved for obesity, occult, recurrent, or atypical hernias
Ultrasound — first-line for inguinal/femoral/umbilical evaluation, especially in children
CT abdomen/pelvis — best for ventral, incisional, occult, and complicated hernias; can show incarceration, obstruction, ischemia
Upper GI series or EGD for symptomatic hiatal hernia evaluation; manometry/pH testing if anti-reflux surgery considered
Treatment
First-line
Elective surgical repair for most symptomatic hernias — open (Lichtenstein tension-free mesh) or laparoscopic (TAPP, TEP) for inguinal
Watchful waiting acceptable for minimally symptomatic men with reducible inguinal hernias
Pediatric inguinal hernias: prompt elective repair after diagnosis given incarceration risk
Femoral hernias: repair at diagnosis regardless of symptoms (high strangulation risk)
Umbilical hernia in children: most close spontaneously by age 4-5; repair if persistent, large (>1.5 cm), or symptomatic
Hiatal: PPI (omeprazole, pantoprazole, esomeprazole) + lifestyle (weight loss, elevate head of bed, avoid late meals); fundoplication (Nissen, Toupet) for refractory GERD or large paraesophageal hernias
Second-line / adjunct
Ventral/incisional hernia: open or laparoscopic repair with mesh; component separation for large defects
Tobacco cessation and weight optimization before elective repair (improves outcomes, reduces recurrence)
Complications
Incarceration and strangulation with bowel ischemia and necrosis
Small bowel obstruction (especially femoral and incisional)
Chronic groin pain after inguinal repair (ilioinguinal, iliohypogastric, genitofemoral nerve injury) — up to 10%
Recurrence (1-5% with mesh repair)
Mesh infection, seroma, hematoma
Volvulus or gastric strangulation in large paraesophageal hiatal hernias
PANCE pearls
Femoral hernia in an older woman with bowel obstruction is a classic exam scenario — examine the groin in every SBO.
Indirect inguinal hernia: lateral to inferior epigastric vessels; direct: medial. Indirect can descend into the scrotum.
Richter hernia involves only the antimesenteric border of the bowel — can strangulate without obstructing.
Littré hernia contains a Meckel diverticulum; Amyand hernia contains the appendix.
Paraesophageal hiatal hernia symptoms (postprandial chest pain, early satiety) warrant elective repair even if mild because of volvulus risk.
References
ACS 2023 — American College of Surgeons / Americas Hernia Society Quality Collaborative recommendations on inguinal and ventral hernia management
HerniaSurge 2018 — HerniaSurge Group: International guidelines for groin hernia management (Hernia 2018)
SAGES 2013 — SAGES Guidelines for the Management of Hiatal Hernia (Kohn et al., Surg Endosc 2013)
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