What role does Cortisol play in allergy?

The provided context does not contain direct information on cortisol's role in allergy. Generally, cortisol is an anti‑inflammatory hormone that can modulate allergic responses (e.g., in hay fever). Chronic stress and cortisol dysregulation may exacerbate allergy symptoms, but the evidence is mostly mechanistic and not supported by the given sources. Therefore, cortisol testing alone is not validated for allergy management.