A true allergic reaction to a drug might involve which of the following symptoms?

A true allergic reaction to a drug is characterized by the immune system's abnormal response to a substance. This immune response can lead to various symptoms, with itching, rash, and difficulty breathing being key indicators.

Itching is often associated with the release of histamines in the body, which is a common response in allergic reactions. A rash may occur as a result of this histamine release, manifesting as hives, eczema, or other dermatological responses. Difficulty breathing indicates a potentially severe allergic reaction, like anaphylaxis, where airway swelling occurs, making breathing challenging.

Recognizing these symptoms is crucial as they can escalate quickly, requiring immediate medical intervention. Other options present symptoms that could be related to different conditions or side effects but do not specifically denote an allergic reaction. For example, pain and swelling might indicate inflammation or irritation, while fever, chills, and fatigue could relate to infections or systemic responses unrelated to allergies.