Gustatory Sweating After Eating: Frey’s Syndrome Misdiagnosed as Food Allergy

Hope & Histamine: The Paediatric Allergy Podcast · Mar 4, 2026 · 26m

Frey’s syndrome can look exactly like a food allergy: facial flushing, warmth, sweating (sometimes even a “rash-like” redness) that appears within minutes of eating. Parents panic, clinicians worry about IgE-mediated reactions, and children can end up labelled with a food allergy they don’t actually have.

In this episode, we unpack Frey’s syndrome (gustatory sweating)—why it happens, who gets it (including infants and children), and the classic pattern: unilateral or patchy facial redness/sweating triggered by eating, with no systemic symptoms like wheeze, vomiting, hypotension, or widespread…