What causes bilirubin?

Cirrhosis may cause normal, moderately high or high levels of bilirubin, depending on exact features of the cirrhosis. Excessive consumption of alcohol is the most common cause of cirrhosis.

It is mostly cause by infected water. There are other reasons as well, like over exercise, drug and alcohol abuse.

Yes it can, it's a common symptom that comes with the Gilbert's syndrome.

Extensive red cell destruction leads to excessive bilirubin formation and jaundice

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