An incisional hernia happens when a weakness in the muscle of the abdomen allows the tissues of the abdomen to protrude through the muscle. The hernia appears as a bulge under the skin, and can be painful or tender to the touch. In the case of an incisional hernia, the weakness in the muscle is caused by the incision made in a prior abdominal surgery. An incisional hernia is typically small enough that only the peritoneum, or the lining of the abdominal cavity, pushes through. In severe cases, portions of organs may move through the hole in the muscle.

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