Why incisional hernias happen
Every abdominal operation leaves a scar in the muscle wall, and scar tissue never regains the full strength of the original muscle and fascia. If healing is stressed — by wound infection, coughing, early heavy lifting, obesity, diabetes, or smoking — the repair line can slowly give way. The result is an incisional hernia: a widening gap under the skin scar through which bowel or fat pushes out.
Common sites include midline laparotomy scars, caesarean-section scars, old open appendix and gallbladder incisions, and previous laparoscopy port sites. The bulge usually appears months to years after the original surgery, grows slowly, and becomes more obvious on standing, coughing, or straining.
Because the surrounding tissue is already scarred, incisional hernias behave differently from ordinary hernias — they widen with time and are more likely to recur after a simple stitch-and-patch repair. International hernia society guidelines recommend mesh reinforcement over suture-only closure for most incisional hernias, because recurrence is markedly lower with mesh. Wide mesh overlap in the correct plane is the key to a durable result. Large, recurrent, or multiply-operated incisional hernias fall under
complex ventral hernia repair — see the full guide for eTEP, Rives-Stoppa, and TAR reconstruction.