The human liver does almost everything for the body. So, hepatitis most commonly is actually very hard to diagnose and is commonly missed. You can have flu like symptoms all the way to complete liver failure, which is life threatening. A lot of times most patients complain of pain to the area, which is diffused. They can also have nausea, vomiting, diffused abdominal pain. The most common warning sign that doctors see, and we're very concerned about, is actually jaundice, which is yellowing or paleness of the skin, paleness of the eyes, which is a sign that the liver is actually under stress and unable to process some of the toxins the body normally does.