Which symptom is NOT associated with illness?

A fast pulse rate is typically a physiological response to various stimuli, including stress, anxiety, or physical exertion, rather than a direct symptom of illness. While it can be associated with certain conditions, it is not exclusively indicative of an illness. On the other hand, dizziness, changes in skin color (like being pale or flushed), and cold sweats are more commonly associated with specific health issues or illness, as they often reflect the body's response to factors such as infection, shock, or other medical conditions that demonstrate distress. Thus, a fast pulse rate, while it can indicate a range of possibilities, is not directly tied to illness in the way that the other listed symptoms are.