Which of the following is NOT a constitutional symptom?

Constitutional symptoms refer to general, non-specific symptoms that affect the overall body and can signify an underlying systemic issue. Common constitutional symptoms include fever, weakness, chills, and unintentional weight loss, among others.

Rash, on the other hand, is a localized skin change and does not indicate a systemic involvement of the body. While it can be indicative of various conditions, it is not classified as a constitutional symptom because it does not reflect the overall health status or systemic response of the body like fever, chills, and weakness do. Instead, a rash is more specific and can often be attributable to dermatological or localized infectious processes rather than a global disturbance.

Therefore, the identification of rash as not being a constitutional symptom is correct, as it does not fit the typical profile of symptoms that imply a body's systemic reaction.