Histamine Intolerance vs MCAS: Key Differences

EPISODE # 53

Histamine Intolerance vs MCAS: How To Tell The Difference

Understanding the Key Differences Between Histamine Intolerance and MCAS

In this informative episode of the Histamine Well Podcast, Joanne explains the key differences between histamine intolerance and Mast Cell Activation Syndrome (MCAS), two conditions that often share similar symptoms but require very different treatment approaches. Learn why some people continue to react despite following a low histamine diet, how mast cells and histamine function differently in the body, and why identifying the underlying root cause is essential for long-term recovery. Joanne also shares her clinical approach to assessing histamine intolerance, MCAS, mould illness, gut dysfunction, and nervous system dysregulation to help patients achieve lasting improvements.

In this episode, you'll learn:

The difference between histamine intolerance and Mast Cell Activation Syndrome (MCAS)
Why the symptoms of histamine intolerance and MCAS often overlap
How histamine is broken down in the body and the role of DAO and HNMT enzymes
Common causes of histamine intolerance, including SIBO, mould, oxalates, gut dysfunction, and hormone imbalances
Why MCAS reactions can be more severe, unpredictable, and triggered by non-food factors
The connection between mould mycotoxins, chronic inflammation, and mast cell activation
Which laboratory tests may be helpful—and which are often less useful in clinical practice
Joanne’s clinical approach to identifying and treating the root causes of histamine-related symptoms

Stay well,

Joanne Kennedy

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