It is not known exactly what causes it but it could be linked to food passing through your gut too quickly or too slowly, oversensitive nerves in your gut, stress and a family history.
Symptoms include cramps, bloating, diarrhoea and constipation.
Doctor Evennett said: “It is most important that if stools are a red colour or if blood is visible in stool, whether it be mixed in with the stool or on the surface, this is checked out, without delay, by a doctor.
“Commonly this may occur due to piles or a tear in the anal tissue, perhaps due to straining, however, blood may be a sign of bowel cancer, and should not be ignored.
Source: | This article first appeared on Express.co.uk