Final answer:
The symptoms described are indicative of a condition called diverticulitis, which is a digestive disease in which small pouches in the wall of the large intestine become infected and inflamed.
Step-by-step explanation:
The symptoms described, including abdominal pain, change in bowel habit, and pencil-thin stool, are indicative of a condition called Diverticulitis. Diverticulitis is a digestive disease in which small pouches in the wall of the large intestine become infected and inflamed. Other symptoms may include fever, nausea, diarrhea or constipation, and blood in the stool.