The healthy liver is soft, smooth and supple. The unhealthy liver contains little nodules, which is an example of cirrhosis, caused by drinking too much alcohol. The liver serves to process all the materials you bring into your body, which it can't do if it's diseased.
The worst thing that can happen to your liver is cancer (right). When your liver becomes damaged, and the body is continually trying to repair itself, it can lead to cancer.