Which of the following symptoms indicates a false allergic reaction?

Fever and gastrointestinal upset are symptoms that typically do not indicate an allergic reaction but rather suggest an illness or infection. Allergic reactions usually involve immune responses to specific allergens and manifest with symptoms such as hives, swelling, rashes, itching, and respiratory difficulties.

In allergic reactions, the body’s immune system responds aggressively, leading to symptoms like hives and swelling, difficulty breathing due to airway constriction, and rashes accompanied by severe itching. These symptoms reflect a true type of immunological response. In contrast, fever and gastrointestinal upset often arise from viral or bacterial infections or other non-allergic conditions, making them less likely to indicate an allergic response. Therefore, recognizing that fever and gastrointestinal upset do not align with typical allergic symptoms underscores why this answer is appropriate for identifying a false allergic reaction.