Gilbert’s syndrome is a common, harmless condition that is inherited (runs in families).
It is caused by a build-up of a yellow pigment, called bilirubin, in the blood.
Bilirubin is found naturally in the blood. It is formed when red blood cells break down. The body usually removes it, but in Gilbert's syndrome, this process does not work properly.
High levels of bilirubin in the blood can cause jaundice (yellowing of the skin and whites of the eyes).
About 1 in 20 people in the UK have Gilbert’s syndrome and it is more common in men than women. It is usually nothing to worry about and does not need treatment.
Continue to next section: Symptoms of Gilbert's syndrome