Hernia

A hernia occurs when an internal organ or tissue, most often part of the bowel or fatty tissue, pushes through a weakness in the surrounding muscle or connective tissue wall. Hernias are extremely common, particularly in the groin, and appear as a swelling or lump that may be more noticeable when standing, coughing, or straining, and less noticeable when lying down.

Most hernias are not immediately dangerous, but they sit on a real spectrum — from a small, easily reducible lump that causes no more than mild discomfort, to a strangulated hernia in which the trapped tissue loses its blood supply, a genuine surgical emergency. Hernias do not resolve on their own and, left alone, tend to gradually enlarge over time, which is why the great majority eventually require surgical repair, and why earlier treatment is generally simpler and lower-risk than treatment delayed until the hernia has grown or become symptomatic.

How Hernias Form

The abdominal wall and groin region rely on layers of muscle and connective tissue to hold internal organs securely in place. A hernia develops when a weak point or gap in this wall — whether present from birth, developed gradually through the natural ageing process, or created by prior surgery or injury — allows underlying tissue to push through under pressure.

This pressure can come from activities and conditions that repeatedly strain the abdominal wall, including heavy lifting, chronic coughing, straining due to constipation, obesity, and pregnancy. Once a defect exists, it typically does not close or strengthen on its own; instead, repeated strain tends to gradually widen it over time, which is part of why hernias generally get larger, not smaller, if left untreated.

Types of Hernia

Inguinal Hernia

The most common type, occurring when tissue pushes through the groin at the top of the inner thigh. Affects men considerably more often than women, related to the natural anatomical passage through which the testicles descend before birth.

Femoral Hernia

Occurs when tissue pushes through a separate passage in the groin, just below the inguinal canal. More common in women, and associated with ageing and repeated abdominal strain. Femoral hernias carry a notably higher risk of strangulation than inguinal hernias, given the narrow, rigid margins of the defect, and are generally recommended for repair even when not causing symptoms.

Umbilical Hernia

Occurs when tissue pushes through the abdominal wall near the belly button. Common in babies, where it often results from incomplete closure of the opening the umbilical cord passed through, and frequently resolves on its own in early childhood. In adults, umbilical hernias are acquired and do not resolve without treatment.

Hiatus Hernia

Occurs when part of the stomach pushes upward into the chest through an opening in the diaphragm. Often causes no symptoms, though it can contribute to heartburn and acid reflux in some people, and is managed somewhat differently from groin and abdominal wall hernias.

From Reducible to Strangulated: The Hernia Spectrum

Understanding hernia severity means understanding three distinct stages, since the urgency of treatment differs enormously between them.

• Reducible: The herniated tissue can be gently pushed back into place, or goes back in on its own when lying down. This is the most common presentation, and while the hernia itself will not resolve on its own, it is not an emergency at this stage.
• Strangulated: The trapped tissue's blood supply is cut off, causing rapidly worsening pain and, without emergency surgery, tissue death within hours. This is a true surgical emergency, and delay significantly increases the risk of needing bowel resection alongside the hernia repair itself.

Femoral hernias, and hernias that have been present a shorter time, carry a higher risk of progressing along this pathway, which is part of why femoral hernias are generally recommended for repair regardless of symptoms, rather than being monitored.

Why Waiting Isn't Entirely Risk-Free

For some men with a small, asymptomatic, or minimally symptomatic inguinal hernia, watchful waiting — monitoring rather than immediate surgery — is a recognised and reasonably safe option, with a low reported rate of incarceration over the following years. However, this approach comes with an important caveat: the large majority of men who initially choose watchful waiting eventually go on to need surgery anyway, most often because the hernia becomes painful or grows larger over time — and this crossover becomes more likely with age.

This is the practical reality behind the principle that addressing a hernia earlier generally means a simpler operation with lower risk: a smaller, uncomplicated hernia is technically more straightforward to repair than one that has enlarged, become symptomatic, or required emergency surgery after incarceration. Femoral hernias fall outside this watchful waiting approach altogether, given their meaningfully higher strangulation risk, and are generally repaired once identified, even without symptoms.

Symptoms of a Hernia

• A visible lump or swelling, often more noticeable when standing, coughing, or straining, and less noticeable when lying down
• A dull ache, pressure, or heaviness at the site of the lump
• A burning or sharp sensation when the hernia bulges through
• For a hiatus hernia specifically: heartburn, acid reflux, or indigestion, sometimes with no palpable lump at all

Symptoms suggesting incarceration or strangulation, which require urgent assessment:

• A lump that has become firm, tender, or discoloured
• Sudden, severe, or rapidly worsening pain at the hernia site
• Inability to push the lump back in, when it was previously reducible
• Nausea, vomiting, or fever alongside the above

Risk Factors for Hernia

• A job involving heavy lifting or long hours of standing
• Chronic coughing, including from smoking or allergies
• Chronic constipation and straining during bowel movements
• Prior abdominal or pelvic surgery, which can create a localised area of weakness
• Pregnancy
• Obesity
• Age — connective tissue naturally weakens over time
• Family history of hernia

How are Hernias diagnosed?

• Physical examination: Often sufficient on its own, the doctor examines the area, sometimes asking the patient to cough or strain, to see or feel the hernia bulge and assess whether it is reducible.
• Ultrasound: A non-invasive imaging option, useful when a hernia is difficult to feel on examination, or to help distinguish a hernia from other causes of a groin or abdominal lump.
• CT Scan: Used for more detailed assessment, particularly when incarceration or strangulation is suspected, or when planning surgical repair for a complex or recurrent hernia.

Reducing Your Risk of Hernia

• Exercise regularly to maintain the strength of your abdominal muscles
• Use proper lifting technique, bending at the knees rather than the waist, and avoid lifting beyond your comfortable capacity
• Address chronic constipation with a high-fibre diet, adequate fluid intake, and regular activity
• Maintain a healthy weight, since excess weight increases pressure on the abdominal wall
• Quit smoking, which contributes to chronic coughing and impairs tissue healing and strength
• Seek treatment for chronic coughing or allergies, since repeated straining from coughing can contribute to hernia formation