Ep. 177: MCAS and Histamine Intolerance: What’s the Difference? with Heather Orrichio | MCAS | Histamine Intolerance | Autoimmune Conditions | Thyroid and Histamine |

Could histamine intolerance be the missing piece behind your anxiety, insomnia, PMS, or gut symptoms? How do you know whether you're dealing with histamine intolerance, MCAS, or a deeper root cause that needs a different approach?

In this episode, I sat down with histamine and MCAS expert Heather Oricchio to talk about one of the most misunderstood topics in women's health. We unpacked the differences between histamine intolerance and mast cell activation syndrome (MCAS), how these conditions show up in the body, and why so many women are struggling with symptoms that seem completely unrelated on the surface.

We discussed the many root causes that can contribute to histamine and MCAS symptoms, including mold exposure, gut dysfunction, chronic stress, hormone imbalances, environmental toxins, and nervous system dysregulation. Heather explained why some people respond well to a low-histamine diet while others continue reacting to foods, supplements, chemicals, and even everyday stressors. We also discussed the testing she uses to uncover hidden contributors and how she approaches putting all of the pieces together.

One of my favorite parts of this conversation was our discussion around stabilization. We talked about why some people cannot tolerate detox protocols, supplements, or even basic interventions until their nervous system and mast cells are more supported. Heather shared how she helps clients build those foundations for healing, what signs indicate someone is ready to move forward, and why addressing root causes requires patience and the right sequence of steps.

We also spent time talking about the powerful connection between the nervous system and chronic illness. Regulating the nervous system before going on an intensive healing journey is one of the most important steps to getting back to normalcy, so I’m so glad we got to talk about that in depth in this episode. Heather shared practical strategies for nervous system regulation, how chronic stress can keep symptoms stuck in place, and why healing often requires more than just supplements and protocols.

If you've been struggling with histamine intolerance, MCAS, mold illness, unexplained symptoms, or feel like you've tried everything without answers, this conversation offers a thoughtful and hopeful perspective on what might be missing from the healing process.

Disclaimer: This information is being provided to you for educational and informational purposes only. It is being provided to educate