Incisional Hernia

What is an Incisional Hernia?

An incisional hernia is a type of abdominal hernia that develops at the site of a previous surgical incision. It occurs when tissue, fat, or part of the intestine pushes through a weakened area of the abdominal wall where a surgical wound has not healed completely or has become weakened over time.

After abdominal surgery, the muscles and connective tissues of the abdominal wall are stitched back together. In most cases, the tissues heal and regain strength. However, in some patients, the surgical scar remains weaker than the surrounding tissue. Over time, pressure in the abdomen can cause internal tissue or organs to protrude through this weakened area, creating a visible or palpable bulge.

Impact of Incisional Hernia on Anatomy and Health

An incisional hernia affects the structural integrity of the abdominal wall. The abdominal wall is made up of several layers of muscle and connective tissue that work together to support the internal organs and maintain abdominal pressure. When these layers weaken or separate at the site of a surgical scar, the natural barrier that keeps organs contained inside the abdomen becomes compromised.

This weakness allows fatty tissue, part of the intestine, or other abdominal contents to push outward through the defect. As a result, patients may notice a lump or swelling beneath or near the surgical scar. The bulge often becomes more noticeable when standing, coughing, lifting heavy objects, or straining.

Over time, an untreated incisional hernia may enlarge because the surrounding muscle continues to weaken under pressure. Larger hernias may cause persistent discomfort, pressure, or a feeling of heaviness in the abdomen. In some cases, the protruding tissue can become trapped in the hernia opening. This is known as incarceration.

A more serious complication is strangulation. This occurs when the blood supply to the trapped intestine or tissue becomes restricted. Strangulated hernias can cause severe pain and may lead to tissue damage or bowel obstruction, requiring urgent medical treatment.

Even when complications do not occur, incisional hernias can affect a patient’s daily activities, physical comfort, and quality of life. Many people experience difficulty with lifting, exercise, or prolonged standing because of discomfort around the hernia.

Risk Factors for Incisional Hernia

Incisional hernias can occur in anyone who has previously undergone abdominal surgery, but certain factors significantly increase the likelihood of developing this condition.

Some patients have a higher risk because of how their body heals following surgery. Others may develop a hernia due to increased abdominal pressure, which places strain on the healing surgical wound.

• Patients who have had abdominal surgery: Any surgical incision in the abdominal wall creates a potential site of weakness. Larger incisions generally carry a higher risk.
• People with wound healing complications: Infections, delayed healing, or reopening of the surgical wound can weaken the scar tissue.
• Individuals who are overweight or obese: Excess body weight increases pressure within the abdomen and can strain the surgical repair.
• Patients with chronic coughing: Long-term coughing from conditions such as lung disease can place repeated pressure on the abdominal wall.
• People who perform heavy lifting or strenuous activity: Physical strain can place stress on the surgical scar before it fully heals.
• Pregnant women: Pregnancy stretches the abdominal muscles and can weaken surgical scars.
• Patients with chronic constipation: Repeated straining during bowel movements increases abdominal pressure.
• Individuals with connective tissue disorders: Some medical conditions weaken the body’s ability to form strong scar tissue.
• Smokers: Smoking can impair circulation and slow wound healing after surgery.

Patients who have had multiple abdominal surgeries may also face a greater risk because repeated incisions can further weaken the abdominal wall.

Causes of Incisional Hernia

Incisional hernias develop when a previous surgical incision fails to heal with sufficient strength. The primary cause is weakness in the abdominal wall at the site of the surgical scar.

In many cases, an incisional hernia develops gradually over time rather than immediately after surgery. A small weakness in the scar may slowly enlarge as abdominal pressure repeatedly pushes against it.

Symptoms of Incisional Hernia

Common symptoms include:

• A visible bulge near the surgical scar: This lump may become more noticeable when standing, coughing, or straining.
• Swelling at the incision site: The area may appear raised or protruding.
• Discomfort or aching pain: Pain may occur during physical activity, lifting, or prolonged standing.
• A feeling of pressure or heaviness in the abdomen: Larger hernias may create a persistent sensation of abdominal strain.
• Pain when coughing or bending: Movement can place pressure on the weakened abdominal wall.

Symptoms that may indicate a more serious complication include:

• Severe or persistent abdominal pain
• Nausea or vomiting
• A bulge that cannot be pushed back in
• Redness or tenderness over the hernia

These symptoms may suggest incarceration or strangulation of the hernia and require prompt medical evaluation.

Preventing Incisional Hernia

Although not all incisional hernias can be prevented, several strategies can significantly reduce the risk after abdominal surgery. Prevention focuses on supporting proper wound healing and reducing pressure on the abdominal wall.

Patients are usually given specific post-operative instructions to help protect the surgical incision while it heals.

• Follow post-surgical care instructions carefully: Proper wound care and rest allow the incision to heal effectively.
• Avoid heavy lifting after surgery: Lifting heavy objects can strain the healing abdominal wall.
• Manage coughing and respiratory conditions: Treating chronic cough reduces repeated abdominal pressure.
• Maintain a healthy weight: Reducing excess weight decreases strain on the abdominal muscles.
• Stop smoking before and after surgery: Smoking slows healing and weakens tissue repair.
• Prevent constipation: A high-fibre diet and adequate hydration can reduce straining during bowel movements.
• Gradually return to physical activity: Patients should follow their surgeon’s guidance when resuming exercise or strenuous activity.

For patients who require abdominal surgery and have risk factors for hernia formation, surgeons may sometimes reinforce the abdominal wall with surgical mesh during the initial operation to reduce the likelihood of a future incisional hernia.

Types of Incisional Hernia

Doctors often classify these hernias based on their location, size, and the behaviour of the hernia contents.

• Reducible Incisional Hernia: This is the most common and least severe type. The bulging tissue can be gently pushed back into the abdomen when the patient lies down or applies light pressure. These hernias may cause mild discomfort but often remain manageable in the early stages.
• Irreducible (Incarcerated) Incisional Hernia: In this type, the herniated tissue becomes trapped outside the abdominal wall and cannot be pushed back inside. Although blood supply may still be intact, the trapped tissue can cause persistent discomfort and may increase the risk of complications.
• Strangulated Incisional Hernia: This is a serious and urgent condition. The blood supply to the trapped tissue or intestine becomes restricted. Without prompt medical treatment, the affected tissue can become damaged or die. Symptoms often include severe pain, nausea, vomiting, and redness around the hernia.
• Large or Complex Incisional Hernia: Some incisional hernias gradually enlarge and involve a significant portion of the abdominal wall. These are often referred to as complex hernias and may require specialised surgical techniques, including abdominal wall reconstruction.
• Multiple Incisional Hernias: In some patients, more than one hernia develops along a previous surgical scar. This may occur if the entire incision line becomes weakened.

The classification of an incisional hernia helps surgeons decide whether observation, minimally invasive repair, or more complex reconstructive surgery is required.

Diagnosis of Incisional Hernia

Doctors may use several methods to confirm the diagnosis and assess the size and severity of the hernia.

• Medical History Assessment: The doctor will ask about previous abdominal surgeries, symptoms, and when the bulge first appeared. Information about pain, physical activity, and changes in the hernia over time may also be discussed.
• Physical Examination: The abdomen is examined while the patient is standing and lying down. Patients may be asked to cough or strain, which increases abdominal pressure and makes the hernia more visible.
• Ultrasound Imaging: An ultrasound scan may be used to confirm the presence of a hernia and assess the size of the abdominal wall defect. This is a simple, non-invasive imaging test.
• CT Scan (Computed Tomography): A CT scan provides detailed images of the abdominal wall and internal organs. It helps surgeons understand the exact location, size, and contents of the hernia, which is important when planning surgery.
• MRI Scan (in selected cases): Magnetic resonance imaging may be used when further detail is required, especially for complex or recurrent hernias.

These diagnostic methods help doctors determine the severity of the hernia and whether treatment or surgery is required.

Treatment for Incisional Hernia

Small hernias that cause minimal symptoms may sometimes be monitored, but many incisional hernias eventually require surgical repair.

• Observation and Monitoring: Small and painless hernias may be monitored over time, particularly in patients who are not suitable candidates for surgery. Regular check-ups are usually recommended.
• Lifestyle Modifications: Patients may be advised to reduce activities that increase abdominal pressure. This may include avoiding heavy lifting, managing a chronic cough, maintaining a healthy weight, and preventing constipation.
• Supportive Abdominal Garments: In some cases, a hernia belt or abdominal binder may help support the abdominal wall and reduce discomfort. However, these devices do not cure the hernia.
• Open Hernia Repair Surgery: In open surgery, the surgeon makes an incision over the hernia site, returns the protruding tissue to the abdomen, and repairs the weakened abdominal wall. Surgical mesh is often used to reinforce the area and reduce the risk of recurrence.
• Laparoscopic Hernia Repair: This minimally invasive procedure uses small incisions and a camera-guided surgical instrument to repair the hernia. Mesh is usually placed internally to strengthen the abdominal wall.
• Robotic Hernia Repair: Some surgeons use robotic-assisted techniques to repair complex hernias with greater precision and improved access to the abdominal wall.

Surgical repair is generally considered the most effective treatment because it restores the strength of the abdominal wall and reduces the risk of complications.

What if an Incisional Hernia is Untreated?

An incisional hernia does not usually heal on its own. Over time, the opening in the abdominal wall can gradually enlarge as pressure continues to push against the weakened tissue.

Without treatment, several complications may develop.

• Hernia Enlargement
• Chronic Discomfort or Pain
• Reduced Physical Activity
• Incarceration
• Strangulation
• Bowel Obstruction

For these reasons, doctors often recommend evaluation and treatment once an incisional hernia is identified, particularly if the hernia is growing or causing symptoms.



Early management can help prevent complications and improve long-term outcomes.