What causes an incisional hernia?
An incisional hernia is one that forms in a previous incision from prior surgery. The incidence of a hernia forming in a previous abdominal scar is about 20%, and is even higher in people who are obese or who are active smokers. The hernia defect itself can form anywhere along the scar tissue of a previous incision, and can be very small to large and complex. Incisional hernias can develop slowly over many or can even occur years after surgery. The underlying cause is usually due to inadequate healing or excessive pressure on the abdominal wall scar.