Can Allergies Cause a Fever?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 21st, 2026.
Allergies typically do not cause fever directly. True allergic reactions involve immune responses that rarely produce elevated body temperature above 99°F. However, complications from allergies can lead to fever-inducing secondary infections. Sinus congestion from allergic rhinitis may trap bacteria, causing sinusitis with temperatures reaching 101-103°F. Similarly, allergic asthma can increase susceptibility to respiratory infections. If you experience fever alongside allergy symptoms like sneezing, runny nose, or itchy eyes, consider bacterial or viral infections rather than the allergies themselves. Antihistamines won't reduce fever, but addressing underlying infections with appropriate medical treatment will.
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