Inguinal Hernia
A weakness in the abdominal wall at the inguinal canal lets peritoneal contents bulge through above and medial to the pubic tubercle, and the entire clinical picture (reducibility, cough impulse, and the danger of strangulation) follows from that defect being a tube the bowel can slide in and out of, or get trapped within.
In a nutshell
An inguinal hernia is peritoneal contents pushed through the inguinal canal, emerging above and medial to the pubic tubercle. Reducibility and cough impulse are simple mechanics of a tube with two ends; when the neck traps the contents, strangulation follows the same ischaemia-to-perforation sequence as any obstructed bowel and is a surgical emergency.
Classic presentation
A groin lump above and medial to the pubic tubercle, worse on standing and straining, reducible with a positive cough impulse, sometimes extending into the scrotum.
Key points
- Inguinal hernias emerge above and medial to the pubic tubercle: the key anatomical discriminator from femoral hernias, which emerge below and lateral to it.
- Indirect hernias traverse the deep ring along the path of the processus vaginalis; direct hernias push through a weakened posterior wall (Hesselbach's triangle), a distinction usually made intraoperatively rather than clinically.
- Irreducibility (incarceration) is the first warning sign; strangulation (constant severe pain, erythema, systemic sepsis) is a surgical emergency requiring urgent operation.
- Elective mesh repair prevents future incarceration and strangulation and is generally offered for symptomatic, reducible hernias.
- A minimally symptomatic, easily reducible hernia in a frail patient may reasonably be managed with watchful waiting.
First-line investigation
Clinical examination standing and lying, with and without straining; ultrasound if the diagnosis is uncertain.
First-line management
Elective mesh repair for a symptomatic, reducible hernia; emergency surgery for an irreducible or strangulated hernia.
Exam traps
- A hernia below and lateral to the pubic tubercle is femoral, not inguinal. Do not assume every groin lump is inguinal.
- Reducibility on examination does not exclude a future risk of strangulation; it is not a reason to defer referral indefinitely.
- Constant severe pain, erythema or systemic illness in a patient with a known hernia should prompt emergency assessment, not reassurance that 'it's just the hernia.'
- Distinguishing direct from indirect hernia clinically (e.g. by occluding the deep ring) is unreliable and does not change emergency management. It does not need to be agonised over acutely.
Educational content pending clinical review. Not medical advice.