Overview

The Biology of Anxiety- How the Brain and Body Shape Fear, Stress, and ResilienceAnxiety is one of the most common and most misunderstood human experiences. Often framed as a mental or emotional problem, anxiety is in fact a whole-body biological response shaped by evolution, brain circuitry, hormones, and environment. In The Biology of Anxiety, scientist Brendon Goh, PhD explores anxiety from the inside out, revealing how the nervous system detects threat, mobilizes the body, and sometimes remains stuck in a state of chronic alert. Drawing on research from neuroscience, physiology, and psychology, this book explains why anxiety can feel overwhelming, persistent, and difficult to control-even in the absence of real danger. You'll learn how key brain regions such as the amygdala and prefrontal cortex interact with stress hormones, the autonomic nervous system, inflammation, and gut-brain signaling to shape anxious thoughts and physical symptoms. The book also examines why modern life amplifies these ancient survival systems, and how repeated stress can rewire the brain toward hypervigilance. Clear, evidence-based, and compassionate, The Biology of Anxiety reframes anxiety not as a weakness or disorder of willpower, but as an adaptive system that can be understood and gradually recalibrated. By grounding recovery in biology rather than blame, this book offers a foundation for resilience rooted in how the human body actually works. Written for readers living with anxiety, as well as clinicians, students, and anyone curious about the science of fear, The Biology of Anxiety provides clarity, validation, and a deeper understanding of one of the most powerful forces shaping human behavior.

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