It will be very hard to tell if this is regrowth of scar or fibrous tissue around the areas of resection but it is indeed a possibility. Other reasons for this would include other unrelated diseases such as diverticulosis. Internal hernias (where loops of intestines can get trapped in fibrous bands inside the abdomen) can also cause this pain. Nevertheless, any new pain in someone with previous resection should indeed warrant further examination such as an endoscopy procedure or an imaging procedure such as a CT scan.
I would suggest you inform your surgeon about this and have yourself worked up.
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