Surgery Surgery · High Yield

Hernia Types

A hernia is a protrusion of an organ or tissue through a defect in its containing wall. Knowing the anatomical classification, distinguishing features, and strangulation risk of each type is essential for every surgical assessment.

✦ The Mnemonic

"In Football, Umbrellas Help Incisions"

Inguinal · Femoral · Umbilical · Hiatus · Incisional — the five most common hernia types

I Inguinal (indirect) Lateral to inferior epigastric vessels; through deep inguinal ring; follows the cord — most common hernia overall

I Inguinal (direct) Medial to inferior epigastric vessels; through Hesselbach's triangle; acquired weakness

F Femoral Below and lateral to pubic tubercle; through femoral canal; more common in women; high strangulation risk

U Umbilical Through umbilical ring; common in infants (usually close by 2 years) and adults (obesity, ascites)

H Hiatus (Hiatal) Gastro-oesophageal junction through the oesophageal hiatus (T10); sliding (most common) vs rolling (para-oesophageal)

I Incisional Through a previous surgical incision; obesity, wound infection, malnutrition increase risk

📚 Clinical Breakdown

Indirect vs direct inguinal hernia: indirect passes through the deep inguinal ring (lateral to inferior epigastric vessels) and follows the inguinal canal — may descend into the scrotum. Direct pushes through Hesselbach's triangle (lateral border rectus abdominis, inguinal ligament, inferior epigastric vessels). Indirect = most common overall; direct = more common in older men.

Femoral vs inguinal hernia: femoral hernias appear below and lateral to the pubic tubercle; inguinal hernias appear above and medial. Femoral hernias have the highest strangulation rate of common hernias (>40% present strangulated) — repair is always indicated even if asymptomatic.

Sliding hiatus hernia (95%): the GOJ slides through the hiatus — GORD is common. Rolling (para-oesophageal) hiatus hernia (5%): the fundus rolls alongside the GOJ through the hiatus — GOJ remains below the diaphragm. Rolling hernias are at risk of volvulus and strangulation — elective repair is recommended even if asymptomatic.

Most common hernia overall Indirect inguinal

Highest strangulation risk Femoral hernia

Femoral vs inguinal landmark Pubic tubercle — femoral: below lateral; inguinal: above medial

Hiatus hernia types Sliding (95%) vs Rolling (para-oesophageal, 5%)

⭐ Clinical Pearl

Strangulation: vascular compromise to the hernial sac contents (usually bowel). Presents with an irreducible, tender, erythematous hernia with features of bowel obstruction. This is a surgical emergency — delay causes bowel infarction. The narrow neck of a femoral hernia and the deep inguinal ring make these sites particularly prone to strangulation.

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