Myths vs facts: Cortisol and Allergie

Cortisol is often demonized as a mere 'stress hormone,' but its role in allergies is more nuanced. Fact: Cortisol is a potent anti-inflammatory that suppresses histamine release and other mediators from mast cells. That's why topical corticosteroids (e.g., for eczema or allergic rhinitis) are safe and effective when used correctly. Myth: 'Cortisol is always bad' – no, an acute cortisol rise can actually dampen an allergic reaction. The real issue is chronic dysregulation: long-term stress can disrupt the cortisol axis, potentially increasing allergy susceptibility in some individuals. However, the effect is variable and not seen in every allergy sufferer. Another myth: 'Salivary cortisol levels directly reflect allergy severity' – evidence is weak, as many factors (time of day, diet, stress) affect the value. Bottom line: Cortisol is an important regulator but not a simple allergy biomarker. Clinical use of corticosteroids is evidence-based; supplements or tests promising 'cortisol optimization' are mostly marketing. Caveat: Systemic corticosteroids have side effects and require medical supervision.