One of the most typical symptoms of constipation is overflow diarrhoea, it occurs when the faeces become so hard that they cannot be expelled and faecal fluid will flow around the block.
There are a number of features that clinically characterize overflow diarrhoea (spurious diarrhoea):
1. It is only fluids that are expelled
2. It most often has the colour of faeces
3. It is not accompanied by abdominal pain
4. It is often difficult for the patient to reach the toilet before it is expelled
5. If a gloved finger is put down into the fluid it will feel threadlike due to the mucus in the stool
6. The patient does not have fever