The reason a patient may experience diarrhea when they are in liver failure is the liver is a crucial part of the digestive system. Without properly doing its job, the system does not function properly. In addition to dealing with diarrhea, the patient may also feel discomfort. They should also be careful to pay attention to the color of their stool as extremely pale, bloody, or tar-colored stool can be another sign of liver failure. If the color of an individual's stool seems off or if they are having trouble with excessively runny stool, they should contact a medical professional as soon as possible.