Each week at Venturis Clinic we review new research on mold-related illness, chronic inflammatory response syndrome (CIRS), and mast cell activation syndrome (MCAS), and translate it into plain English. Here’s what stood out this week.
MCAS just got its 2026 status report
If you’ve ever been told mast cell activation syndrome “isn’t a real diagnosis,” here’s something worth knowing: one of the major allergy/immunology journals recently published a “Status 2026” expert update on how MCAS should be diagnosed and managed, and a companion paper reviewed six years of experience with the international consensus criteria doctors use to identify it. Translation: MCAS is a recognized condition with published diagnostic criteria that experts around the world are actively refining — this is mainstream medical literature, not a fringe idea.
For patients, that means there is now a well-documented framework for evaluation: symptoms in multiple body systems, laboratory evidence of mast cell mediators, and response to mast-cell-directed support. It also means you can walk into an appointment with peer-reviewed literature in hand.
Sources: Diagnosis and Management of Patients With Mast Cell Activation Syndromes: Status 2026 (JACI: In Practice) and Progress in MCAS: the global consensus-2 diagnostic criteria at six years (PubMed)
How mold toxins can set off mast cells
Why do so many people with mold exposure develop histamine-type symptoms — flushing, hives, food reactions, racing heart, brain fog? Two accessible reviews this week walk through the proposed mechanism: mycotoxins (toxic compounds produced by certain molds) can activate mast cells directly and contribute to inflammation in the brain and body. For people straddling both the mold and MCAS worlds, this is a helpful explainer of why the two so often travel together.
Sources: How mycotoxins trigger mast cell activation and brain inflammation (Vibrant Wellness) and Mold and mycotoxin illness: its connection to ME/CFS, MCAS, and chronic symptoms (RTHM)
“Which mold test should I get?” — where ERMI fits
One of the most common questions we hear is about home testing. ERMI (Environmental Relative Moldiness Index) is a DNA-based dust test originally developed by the EPA for research purposes. It can be a useful screening tool, but it has real limitations, and it was never designed as a stand-alone clinical verdict on a building. A balanced approach usually pairs testing with a careful history — when symptoms started, whether they followed a leak or flood, and whether they ease away from home.
Sources: EPA’s original ERMI documentation and The pros and cons of ERMI testing (IndoorDoctor)
A story we hear often
The following is a fictional, composite patient created for education — not a real person.
“David,” 38, moved his family into an older Edmond rental after the 2023 storms. Within a year: sinus congestion that never leaves, hives after meals that never used to bother him, heart palpitations, anxiety that came out of nowhere, and a strange chemical sensitivity — perfume aisles and gas stations now wreck him for hours. His wife feels fine. His doctor ran allergy tests: negative. He was offered an antihistamine and a referral to psychiatry.
A case like David’s can teach three things. First, one person in a home getting sick while others feel fine doesn’t rule out an environmental cause — genetic and immune differences mean people can respond very differently to the same building. Second, his “random” collection of symptoms — skin, sinuses, heart, gut, mood, chemical sensitivity — is exactly the multi-system pattern described in the mast cell activation literature, and mold exposure is one recognized trigger being studied. Third, standard allergy testing looks for IgE allergies — it wasn’t designed to detect mast cell activation or biotoxin-related illness, which is why “your tests are normal” and “something is genuinely wrong” can both be true at the same time.
A story like David’s is a reminder to ask about the building, not just the body: When did symptoms start? Did they follow a move, a leak, a flood? Do they ease when you travel? Those questions cost nothing — and they’re often the most revealing “test” of all.
This article is educational only and is not medical advice. It does not describe any real patient, and reading research summaries is not a substitute for individualized care from a qualified clinician.
Venturis Clinic is an integrative and regenerative medicine clinic in Oklahoma City that works with patients navigating mold-related illness, CIRS, MCAS, and other complex chronic conditions. If you’d like to talk with our team, you can schedule a new-patient pre-consult or call/text us at 405-848-7246.
