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Postoperative Complications of Hernia Surgery: Warning Signs & Treatment

  • Prof. Dr. Zahid Mahmood
  • August 8, 2026

Postoperative Complications of Hernia Surgery: Warning Signs & Treatment

Medically reviewed by Prof. Dr. Zahid Mahmood, MBBS, FCPS — General, Laparoscopic & Laser Surgeon, Lahore.

Most patients recover well after open or laparoscopic hernia repair. Pain, bruising and mild swelling are expected during early healing, but some symptoms can indicate a complication requiring medical review.

This guide explains common early and late problems after groin, umbilical, ventral and incisional hernia surgery. Individual risk varies with the type and size of hernia, surgical technique, emergency versus planned surgery, smoking, obesity, diabetes and general health.

Normal recovery or complication?

Common temporary findings include:

  • Wound soreness and pulling discomfort
  • Mild-to-moderate bruising
  • Temporary swelling around the repair
  • A firm healing ridge beneath an incision
  • Groin or scrotal bruising after inguinal hernia repair
  • Bloating or shoulder-tip pain after laparoscopic surgery
  • Tiredness and reduced appetite for a few days

Symptoms should generally improve. Increasing pain, spreading redness, fever, repeated vomiting, breathing difficulty or rapidly enlarging swelling is not routine recovery.

Early complications

1. Uncontrolled pain

Some pain is expected, but severe or worsening pain may indicate a haematoma, infection, urinary retention, bowel problem or another complication. Pain should be assessed if prescribed medicine is not helping or if it is accompanied by fever, vomiting or increasing swelling.

2. Seroma

A seroma is a collection of clear fluid where the hernia sac or tissue was removed. It can create a soft or firm lump and may be mistaken for recurrence.

Many seromas are harmless and resolve over weeks. Aspiration is not routinely required because introducing a needle can cause infection. Large, painful, persistent or uncertain swellings should be examined.

3. Haematoma and bleeding

A haematoma is a collection of blood in the wound, groin or scrotum. Bruising is common, but concern rises with rapid enlargement, severe tension, dizziness, faintness, persistent wound bleeding or a significant fall in blood pressure.

Small haematomas often settle with observation. Ongoing bleeding or a large painful collection may require imaging, drainage, transfusion or another operation.

4. Wound infection

Signs include:

  • Increasing redness, warmth and tenderness
  • Pus or bad-smelling discharge
  • Fever or chills
  • Opening of the wound
  • Pain that worsens after initially improving

Treatment may include wound care, antibiotics and drainage. Early assessment helps prevent deeper infection.

5. Mesh infection

Mesh infection is uncommon but more serious than a superficial skin infection. It may present with persistent drainage, an abscess, fever, a non-healing sinus or infection recurring after antibiotics.

Treatment depends on depth and severity. Drainage and prolonged antibiotics may be used, but infected mesh occasionally requires partial or complete removal.

6. Urinary retention

Some patients cannot empty the bladder after anaesthesia and groin surgery. Risk is higher with prostate enlargement, older age, spinal anaesthesia, intravenous fluids and some pain medicines.

Symptoms include lower abdominal discomfort, repeated urge to urinate and passing only small amounts. A bladder scan and temporary catheter may be needed.

7. Nausea, vomiting and ileus

Anaesthesia and pain medicines can cause temporary nausea. Persistent vomiting, abdominal swelling and failure to pass gas may indicate postoperative ileus or bowel obstruction and requires assessment.

8. Bowel injury or obstruction

Injury to bowel is rare but potentially serious. It may be recognised during surgery or present later with severe abdominal pain, fever, vomiting, abdominal rigidity or serious illness.

Internal adhesions, port-site hernia or an unrecognised bowel problem can also cause obstruction. CT scanning and urgent surgery may be required.

9. Bladder or blood-vessel injury

Bladder and major vascular injuries are uncommon and occur mainly during complex or laparoscopic repair. Blood in urine, inability to urinate, severe abdominal pain, falling blood pressure or unexplained anaemia requires urgent investigation.

10. Testicular and spermatic-cord complications

After inguinal hernia repair, scrotal bruising and mild testicular discomfort may occur. Rarely, injury or thrombosis of vessels can impair testicular blood supply, causing severe pain and swelling and later testicular shrinkage.

Marked, increasing or sudden testicular pain should be assessed urgently.

11. Blood clots

Deep-vein thrombosis can cause pain and swelling in one leg. A clot reaching the lungs can cause chest pain, sudden breathing difficulty, rapid heartbeat, fainting or coughing blood.

Early walking and prescribed preventive measures reduce risk. Suspected pulmonary embolism requires emergency care.

12. Anaesthetic and chest complications

Possible problems include allergic reactions, chest infection, breathing difficulty, heart complications and confusion, particularly in older or medically unwell patients. Persistent shortness of breath, chest pain or reduced consciousness requires urgent assessment.

Late complications

13. Chronic postoperative pain

Pain persisting for more than three months after groin hernia repair is called chronic postoperative inguinal pain. Causes may include nerve irritation or entrapment, scar tissue, mesh-related inflammation, recurrence or a separate hip, spine, urinary or testicular condition.

Assessment may include examination, imaging and sometimes diagnostic nerve injections. Treatment can involve medicines, physiotherapy, pain-specialist care, nerve blocks or carefully selected revision surgery.

14. Numbness and altered sensation

Small skin nerves can be stretched, divided or irritated during surgery. Numbness, tingling or hypersensitivity often improves over time but may persist. New severe burning or electric-shock pain should be discussed with the surgeon.

15. Hernia recurrence

A recurrent hernia produces a new bulge or discomfort at or near the repaired site. Risk factors include a large or complex defect, emergency surgery, wound infection, smoking, obesity, connective-tissue weakness, persistent cough and some technical factors.

A postoperative lump is not always recurrence; seroma and healing tissue are common. Examination and ultrasound or CT can clarify the diagnosis.

16. Mesh migration, erosion or fistula

Late mesh movement or erosion into nearby structures is rare. Symptoms depend on the organ involved and may include chronic infection, drainage, urinary symptoms, bowel symptoms or persistent pain. Specialist imaging and surgery may be required.

17. Adhesions and chronic bowel symptoms

Internal scar tissue can develop after abdominal surgery. Most adhesions cause no symptoms, but rarely they can contribute to bowel obstruction. Repeated vomiting, abdominal swelling and inability to pass stool or gas requires urgent assessment.

18. Port-site hernia

After laparoscopic repair, a new hernia can rarely develop through one of the instrument sites. It may cause a small painful lump and, if bowel becomes trapped, obstruction. Persistent swelling at a port site should be examined.

19. Cosmetic concerns

Thickened scars, contour irregularity, asymmetry or persistent swelling can affect satisfaction despite a strong repair. Some improve over months; others may require scar care, imaging or revision after healing is complete.

When should I contact the surgeon promptly?

  • Fever above 38°C or chills
  • Increasing wound redness, warmth, pus or bad smell
  • Pain that is worsening or not controlled
  • Persistent bleeding or rapidly enlarging swelling
  • Repeated vomiting or increasing abdominal distension
  • Inability to pass urine
  • Marked groin or testicular pain
  • A new or enlarging lump at the repair
  • Persistent drainage or a wound that does not heal

When is it an emergency?

Go to an emergency department for:

  • Severe breathing difficulty or chest pain
  • Coughing blood, fainting or a rapid heartbeat
  • A swollen painful leg with breathing symptoms
  • Severe abdominal pain, rigidity or repeated vomiting
  • Confusion, collapse or signs of severe infection
  • Rapidly expanding swelling with dizziness or weakness

How are complications investigated?

Depending on symptoms, evaluation may include blood tests, urine tests, wound culture, ultrasound, CT scan, bladder scan or vascular imaging. Chronic pain sometimes requires assessment by a multidisciplinary team.

Reducing the risk of complications

  • Stop smoking before and after surgery.
  • Optimise diabetes, weight and other medical conditions.
  • Tell the team about blood thinners and all medicines.
  • Follow fasting, wound and activity instructions.
  • Walk early and use prescribed blood-clot prevention.
  • Prevent constipation and treat chronic cough.
  • Do not resume heavy lifting faster than advised.
  • Report warning symptoms early rather than waiting.

Key message

Most hernia repairs heal without serious problems. Mild pain, bruising and swelling are common, but symptoms should improve. Fever, spreading redness, uncontrolled pain, repeated vomiting, urinary retention, rapidly increasing swelling or breathing symptoms require medical attention. Late problems such as chronic pain, recurrence and mesh infection should be assessed by a surgeon experienced in hernia care.

Postoperative hernia assessment in Lahore

If you have persistent pain, swelling, wound problems or concern about recurrence after hernia surgery, Prof. Dr. Zahid Mahmood can assess the repair and arrange appropriate imaging or treatment.

For an appointment, call 0300 413 0159 or visit professorzahid.com.

This article is for general education and does not replace assessment by your surgeon. Severe breathing difficulty, chest pain, severe abdominal pain, repeated vomiting or collapse requires emergency care.

Medical references

  1. Williams NS, O’Connell PR, McCaskie AW, editors. Bailey & Love’s Short Practice of Surgery. 28th ed. CRC Press; 2023. Chapter 64, “The abdominal wall, hernia and umbilicus,” pp. 1059–1082.
  2. HerniaSurge Collaboration. Update of the international guidelines for groin hernia management. 2023.
  3. American College of Surgeons. Adult inguinal and femoral groin hernia repair.
  4. Guy’s and St Thomas’ NHS Foundation Trust. Recovery after inguinal hernia repair.

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