Final answer:
The client's post-op pain is due to peristalsis returning in the intestines after the surgery.
Step-by-step explanation:
The post-op pain experienced by the client is likely due to peristalsis returning in the intestines after the surgery.
Peristalsis is the wave-like contractions of the muscles in the digestive tract that helps move food through the system. After a resection of the small bowel, it takes some time for peristalsis to return to normal.
As peristalsis resumes, the intestines may become distended, causing discomfort and abdominal pain.