What is considered a normal stool diameter and how can changes in stool size indicate potential health issues?

A normal stool diameter is typically about 1 to 1.5 inches in diameter. Changes in stool size, such as narrow or pencil-thin stools, can indicate potential health issues like bowel obstruction, colon cancer, or inflammatory bowel disease. It is important to pay attention to changes in stool size and consult a healthcare provider if there are concerns.