Which of the following is a common symptom of hepatitis B virus infection?

Dark urine is a common symptom of hepatitis B virus infection due to the increased levels of bilirubin in the bloodstream. When the liver is inflamed or damaged, as can occur with hepatitis B, its ability to process bilirubin decreases. This buildup of bilirubin can lead to jaundice, which is characterized by yellowing of the skin and eyes and can also result in darker urine.

In contrast, while joint pain can sometimes occur during viral infections, it is not a principal symptom of hepatitis B. Similarly, a skin rash is not typically associated with this virus, as it primarily affects liver functions. Difficulty breathing is unrelated to hepatitis B and is more indicative of respiratory issues or allergic reactions. Understanding these distinctions helps in recognizing the key symptoms of hepatitis B and differentiating them from symptoms of other conditions.