Which of the following is a common sign of liver damage?

Jaundice is a key indicator of liver damage and is characterized by yellowing of the skin and eyes. This occurs when there is a build-up of bilirubin in the bloodstream, a substance that is normally processed by the liver. When the liver is damaged, its ability to conjugate and excrete bilirubin decreases, leading to elevated levels in circulation and the subsequent development of jaundice. This phenomenon can be a result of various liver conditions, such as hepatitis, cirrhosis, or bile duct obstruction.

The other options, while they may present in some conditions or diseases, do not specifically indicate liver damage. Weight gain can occur for numerous reasons, including lifestyle factors or other health issues. Diarrhea can result from a wide range of gastrointestinal problems and is not exclusive to liver damage. Fever is a common sign of infection or inflammation in the body but is not specifically linked to liver dysfunction. Thus, jaundice stands out as a direct and common sign of liver damage.