Beyond Allergy: Histamine as a Key Clinical Signal in Complex Chronic Disease

Victor Sorrentino1

1MD, Medical Director, VS Clinic; Founding Member, Brazilian Society of Functional and Integrative Medicine (SBMFI), São Paulo and Porto Alegre, Brazil, [e-mail]

Abstract

Histamine is classically taught as a mediator of allergy, yet a growing body of clinical observation positions it as a systemic signal connecting immune activation, intestinal permeability, mast cell behaviour, chronic inflammation, neurological manifestations and hormonal imbalance. Patients with unexplained, fluctuating and multi-system complaints are frequently investigated organ by organ, accumulate partial diagnoses and remain refractory to standard treatment. This workshop proposes that histamine represents a major turning point in the understanding and resolution of chronic disease, and that recognising histamine-driven patterns is directly relevant to traditional and complementary medicine, where diet, gut health, environmental exposure and individual susceptibility have long been central to clinical reasoning. The aim of the workshop is to provide clinicians with a practical, reproducible framework for identifying and managing histamine-related disorders in everyday practice. The session will address the physiology and metabolism of histamine, including diamine oxidase and histamine N-methyltransferase activity and the genetic and acquired factors that impair them; the mast cell as an interface between environment, immunity and the nervous system; the clinical phenotypes of histamine excess across dermatological, gastrointestinal, cardiovascular, gynaecological, neurological and psychiatric presentations; the contribution of the intestinal microbiota and intestinal permeability; which laboratory and clinical investigations are useful and how to interpret their limitations; and therapeutic strategies including low-histamine dietary protocols, gut-repair approaches, mast cell stabilisation, micronutrient support and the review of histamine-liberating medications. The workshop will combine theoretical presentation with case discussion drawn from clinical practice, a step-by-step diagnostic algorithm and an open question-and-answer session. By the end of the workshop, participants are expected to recognise the clinical pattern of histamine intolerance and mast cell activation, to evaluate when it should be considered in a differential diagnosis, and to apply a structured therapeutic sequence in patients previously classified as refractory. The contribution of this workshop is to offer an integrative, mechanism-based reading of a common but under-recognised clinical problem, bridging scientific evidence and integrative medical traditions, and to encourage interdisciplinary collaboration between allergists, gastroenterologists, neurologists, gynaecologists, nutrition professionals and integrative practitioners. The key take-home message is that in complex chronic disease histamine is often not a secondary detail, but the thread that unifies apparently unrelated symptoms — and addressing it can change the course of the case.

Keywords: histamine; mast cell activation; intestinal permeability; chronic inflammation; integrative medicine.