Episode Details

Many people with flushing, hives, anxiety, brain fog, digestive issues, food sensitivities, and heart palpitations are told they have either histamine intolerance or Mast Cell Activation Syndrome (MCAS). While these conditions can look remarkably similar, they have very different underlying mechanisms—and understanding those differences is often the key to finding the right treatment.

In this episode, Joanne explains the difference between histamine intolerance and MCAS, why symptoms overlap, and why some people continue to react despite following a low histamine diet. Drawing on her clinical experience, Joanne explores how histamine is processed in the body, the role of DAO and HNMT enzymes, common triggers for mast cell activation, and why addressing the root cause is essential for long-term recovery.

She also discusses the connection between mould mycotoxins, gut dysfunction, SIBO, oxalates, nervous system dysregulation, and histamine-related illness, while sharing practical insights into how she approaches assessment and treatment in clinical practice.

In this episode, you'll learn:

• The difference between histamine intolerance and Mast Cell Activation Syndrome (MCAS)
• Why these conditions share many of the same symptoms but require different treatment approaches
• How DAO and HNMT enzymes help regulate histamine in the body
• Common causes of histamine intolerance, including gut dysfunction, SIBO, mould exposure, oxalates, and hormone imbalances
• Why MCAS symptoms are often 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 why some commonly recommended tests have limited clinical value
• Joanne's clinical approach to identifying and treating the root causes of histamine-related symptoms

Whether you're navigating histamine intolerance, suspect MCAS, or you're a healthcare practitioner wanting a deeper understanding of these complex conditions, this episode provides practical, evidence-informed insights to help you take the next step towards better health.

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