Which of the following is a symptom of a non-functioning liver?

Nausea is a well-documented symptom associated with liver dysfunction. The liver plays a crucial role in many biochemical processes, including the production of bile, which is essential for digestion. When the liver is not functioning properly, it can lead to the accumulation of toxins in the body, which can upset the gastrointestinal system and result in nausea. Additionally, the liver's role in metabolism means that its dysfunction can also lead to imbalances that manifest as gastrointestinal symptoms, including nausea.

While other symptoms like rash, shortness of breath, and frequent urination may potentially be related to various health issues, they are not specific indicators of liver dysfunction. Rash might result from an autoimmune process or another skin condition, shortness of breath could be linked to respiratory or cardiovascular conditions, and frequent urination can arise from a range of factors including diabetes or urinary tract problems. Therefore, nausea stands out as the symptom that is most closely tied to non-functioning liver conditions.