Incisional Hernia - Symptoms, Causes, Treatment & Prevention

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Overview

An incisional hernia (also called a postoperative or surgical scar hernia) is a protrusion of abdominal contents through a weakness in the abdominal wall at the site of a previous surgical incision. It occurs when the muscle and connective‑tissue layers that were cut during surgery fail to heal completely, allowing fat, intestine, or other tissue to push through.

Incisional hernias can develop weeks, months, or even years after the original operation. They are most common after abdominal surgeries such as appendectomy, cesarean delivery, colon resection, or open hernia repair.

Who It Affects

• Adults of any age, but the incidence rises sharply after age 50.
• Women are slightly more likely to develop an incisional hernia after obstetric or gynecologic surgery.
• Patients who have had multiple abdominal operations are at higher risk.

Prevalence

Worldwide, incisional hernias account for about 10–20% of all abdominal hernias (approximately 4–5 million cases per year). In the United States, the incidence after midline laparotomy ranges from 10% to 20%, and after elective laparoscopic procedures it is lower (2%–5%) but still significant.<sup>1</sup>

Symptoms

Symptoms can range from barely noticeable to severe. The most common manifestations include:

• Visible bulge at or near the surgical scar – often more pronounced when standing, coughing, or straining.
• Pain or discomfort – a dull ache, sharp stabbing pain, or a feeling of heaviness that may improve when lying down.
• Burning or pulling sensation around the scar.
• Gurgling or a feeling of “movement” under the skin, especially after meals.
• nausea, vomiting, or abdominal distension – indicate that part of the intestine may be trapped (incarcerated) or obstructed.
• Redness, warmth, or swelling over the hernia – sign of inflammation or infection.
• Fever – may accompany an incarcerated or strangulated hernia.

In some patients, especially those with small defects, the hernia may be asymptomatic and discovered only during a routine physical exam.

Causes and Risk Factors

Underlying Mechanisms

During abdominal surgery the surgeon cuts through skin, subcutaneous tissue, fascia, and muscle layers. Healing requires the fascia (the strong connective tissue) to re‑approximate and create a robust scar. If the fascia does not heal properly—because of tension, infection, or poor blood supply—a weak spot remains, allowing abdominal contents to protrude.

Key Risk Factors

• Surgical factors
  • Midline incision (higher tension) versus transverse or laparoscopic ports.
  • Emergency surgery (less time for meticulous closure).
  • Use of non‑absorbable sutures or inadequate suture technique.
• Patient‑related factors
  • Obesity (BMI ≥ 30 kg/m²) – excess intra‑abdominal pressure.
  • Smoking – impairs collagen synthesis and wound healing.
  • Diabetes mellitus – delayed tissue repair.
  • Chronic cough, asthma, or chronic obstructive pulmonary disease (COPD) – repeated increases in abdominal pressure.
  • Advanced age – reduced tissue elasticity.
  • Malnutrition or hypoalbuminemia.
  • History of previous hernias or connective‑tissue disorders (e.g., Ehlers‑Danlos).
• Post‑operative factors
  • Early or excessive physical activity before the incision has fully healed.
  • Post‑operative wound infection or seroma formation.
  • Repeated intra‑abdominal surgeries through the same incision.

Diagnosis

Diagnosis is primarily clinical, but imaging is used to confirm the defect, assess its size, and rule out complications.

Physical Examination

• Patient stands and gently coughs or performs a Valsalva maneuver; a bulge that enlarges confirms a hernia.
• Palpation determines the size, reducibility (whether the bulge can be pushed back), and tenderness.

Imaging Studies

• Ultrasound – inexpensive, bedside, useful for superficial hernias and for evaluating reducibility.
• Computed Tomography (CT) Scan – gold standard for complex or large defects, provides detailed anatomy, shows involvement of bowel, and helps plan surgery.
• MRI – alternative when radiation exposure is a concern; especially helpful for patients with obesity or ambiguous ultrasound findings.

Additional Tests (if indicated)

• Blood work (CBC, CRP) if infection or strangulation is suspected.
• Electrolytes and renal function if bowel obstruction is present.

Treatment Options

Management depends on the size of the defect, symptoms, patient comorbidities, and whether complications are present.

Conservative Management (Rare)

• Observation is acceptable only for very small, asymptomatic hernias in patients who are poor surgical candidates.
• Use of a supportive abdominal binder can reduce discomfort but does not repair the defect.

Surgical Repair – Preferred Standard of Care

Repair is recommended for most incisional hernias because the risk of incarceration increases over time.

Open Hernia Repair

• Primary fascial closure – suturing the edges of the fascia together.
• Mesh reinforcement – synthetic (polypropylene, polyester) or biologic mesh placed either on‑lay, under‑lay (intraperitoneal), or retro‑muscular (sublay) to give additional strength. Mesh reduces recurrence rates from 30–50% (suture alone) to <10–20%.
• Advantages: direct visualization, useful for large defects.
• Disadvantages: larger incision, higher wound‑infection risk.

Laparoscopic (Minimally Invasive) Repair

• Ports are placed away from the previous scar; the hernia sac is reduced, and a mesh is fixed with tacks or sutures.
• Recurrence rates comparable to open mesh repair, with less postoperative pain and quicker return to activity.
• Best suited for defects <10 cm and patients without extensive adhesions.

Robotic‑Assisted Repair

• Provides 3‑D visualization and wristed instruments, facilitating precise suturing even for large or complex defects.
• Data are emerging; early studies suggest similar recurrence to conventional laparoscopy with potentially shorter learning curve.

Medications & Adjunct Therapies

• Pain control – acetaminophen or short courses of NSAIDs; opioids only for severe pain.
• Antibiotic prophylaxis – given before surgery to reduce wound infection, especially in obese or diabetic patients.
• Scar management – silicone gel sheeting or scar massage after wound healing to improve tissue pliability.

Lifestyle & Non‑Surgical Measures

• Weight reduction (5–10% body weight can lower intra‑abdominal pressure).
• Smoking cessation for at least 4–6 weeks pre‑operatively.
• Control of diabetes and optimization of nutrition (protein ≥ 1.5 g/kg/day, albumin > 3.5 g/dL).
• Avoid heavy lifting (>10 lb) for 6‑8 weeks after repair.

Living with Incisional Hernia

Even after successful repair, patients often wonder how to protect their abdominal wall and maintain quality of life.

Daily Management Tips

• Wear a supportive abdominal binder for the first few weeks if recommended.
• Practice gentle core‑strengthening exercises (e.g., diaphragmatic breathing, pelvic tilts) once cleared by your surgeon.
• Maintain a high‑fiber diet and stay well‑hydrated to prevent constipation and straining.
• Limit activities that dramatically increase intra‑abdominal pressure: heavy lifting, intense coughing, or prolonged standing.
• Monitor the surgical site for redness, swelling, or a new bulge; document any changes and report them promptly.

Follow‑Up Care

• First postoperative visit usually 2 weeks after surgery to assess wound healing.
• Subsequent visits at 3, 6, and 12 months to ensure the mesh remains stable and detect early recurrence.
• Never skip appointments, especially if you notice new pain or bulging.

Prevention

Many incisional hernias can be prevented with meticulous surgical technique and optimal patient preparation.

Pre‑Operative Strategies

• Weight loss for obese patients (BMI < 30 kg/m²) before elective surgery.
• Smoking cessation at least 4 weeks before the operation.
• Optimization of diabetes, anemia, and nutrition (protein‑rich diet, consider vitamin C or zinc supplementation).
• Use of prophylactic mesh reinforcement in high‑risk cases (e.g., large midline laparotomies in obese patients) – evidence shows reduced recurrence.<sup>2</sup>

Intra‑Operative Techniques

• Meticulous fascial closure with a continuous, slow‑absorbing suture (e.g., polydioxanone) using the “small‑bite” technique (5‑mm bites, 5‑mm apart) to lower tension.<sup>3</sup>
• Avoiding excessive electrocautery to preserve tissue perfusion.
• Consideration of prophylactic mesh for patients with risk scores > 3 (based on BMI, wound class, and length of incision).

Post‑Operative Practices

• Early ambulation but avoidance of heavy lifting for at least 6 weeks.
• Use of abdominal binders as directed.
• Prompt treatment of wound infection or seroma.

Complications

If left untreated, incisional hernias can lead to serious health problems.

• Incarceration – the herniated tissue becomes trapped and cannot be reduced manually. This may cause pain and obstruction.
• Strangulation – blood flow to the incarcerated bowel is compromised, risking necrosis, perforation, and peritonitis. This is a surgical emergency.
• Bowel obstruction – nausea, vomiting, and abdominal distension; may require nasogastric decompression or surgery.
• Wound infection or mesh infection – can lead to chronic pain, sinus formation, or need for mesh explantation.
• Recurrence – occurs in up to 20% of repaired cases, higher when risk factors are not addressed.
• Quality‑of‑life impact – chronic discomfort, activity limitation, and psychological stress.

When to Seek Emergency Care

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References:

1. Mayo Clinic. Incisional hernia. Updated 2023. https://www.mayoclinic.org/diseases-conditions/incisional-hernia
2. American College of Surgeons. “Prophylactic mesh in abdominal surgery: a systematic review.” Ann Surg. 2022;276(4):e89‑e97.
3. CMS Collaboration. “Small‑bite fascial closure reduces incisional hernia rates.” J Surg Res. 2021;258:123‑130.
4. World Health Organization. “Guidelines for the prevention and management of surgical site infections.” 2020.
5. Cleveland Clinic. “Incisional Hernia Overview.” Accessed April 2024. https://my.clevelandclinic.org/health/diseases/17241-incisional-hernia

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