The Bristol stool scale is a chart that can help classify stools into groups to identify a healthy bowel movement. Hard, pebble-like stool is a sign of constipation, which can happen for many reasons.

This Old-School Constipation Fix Is Still #1 ... If your types of poop occasionally fall into a non-normal category on the Bristol Stool Chart, you don't have to be alarmed.

But real quick, let us introduce you to the Bristol stool scale, a handy-dandy chart listing the different types of poop your body can make. They range from type one, hard lumps, to type seven ...