What is NOT typically a symptom of infection?

Difficulty breathing is not typically categorized as a direct symptom of an infection. While infections can lead to respiratory issues, especially in severe cases or with certain types of infections (like pneumonia or COVID-19), difficulty breathing itself is more often associated with respiratory distress or specific medical conditions that may not relate solely to infection.

On the other hand, the other options are commonly linked with infections. Excessive itchiness can occur with skin infections or allergic reactions. Heat or warmth is a classic sign of localized infection due to increased blood flow to the area as part of the inflammatory response. Nausea and fatigue are also frequent systemic symptoms associated with various infections, as the body mobilizes resources to fight the invading pathogens. Understanding these distinctions can aid in recognizing the signs of infection and seeking appropriate medical attention when necessary.