When the Body Overreacts - A calm, clinical guide to MCAS, immune reactivity, and the nervous system

Many people with MCAS or complex, multisystem symptoms are told their labs are normal, their triggers are inconsistent, or their symptoms are difficult to explain. This can leave individuals feeling confused, dismissed, or unsure how to move forward.

When the Body Overreacts is a short, clinical, education-focused ebook that explains:

• Why immune reactions can feel unpredictable
• How the nervous system influences immune reactivity
• Why symptoms often affect multiple body systems
• Why stress worsens symptoms — physiologically, not psychologically
• Why labs may be normal even when symptoms are real
• How to understand flares without self-blame

This book does not provide medical advice or treatment protocols. Instead, it offers clarity, validation, and language to help readers better understand their bodies and navigate care more effectively.

Written for individuals with diagnosed or suspected MCAS, as well as those experiencing unexplained immune reactivity, pain, fatigue, or sensitivity.

Written by a licensed acupuncturist, When the Body Overreacts provides an educational framework for understanding Mast Cell Activation Syndrome (MCAS) and related immune reactivity patterns without medical jargon, hype, or promises.