Diarrhoea is a common problem involving the frequent passing of loose bowel motions (also known as stools, faeces or poo). Diarrhoea has many possible causes.
Constipation is when your bowel motions ('poo' or faeces) are infrequent / incomplete and you have trouble passing them because they are often dry and hard.
Bristol Stool Chart
The Bristol Stool Chart was developed in 1997 as a clinical assessment tool. There are seven types of stools (faeces) according to the Bristol Stool Chart. The Bristol Stool Chart or Bristol Stool Scale is a medical aid designed to classify faeces into seven groups.