The Two Causes of All Disease reveals what thousands of patients have already discovered:

• Your body is not broken.
• You can heal.
• And the path back to health is far simpler than you’ve been led to believe.

In this groundbreaking book, physician Derek Guillory, MD shows you how every illness, no matter how confusing, chronic, or frightening comes down to just two causes: deficiency and toxicity. When you understand what your body needs more of, and what it desperately needs less of, healing becomes not only possible… but inevitable.

This book will teach you how to partner with the perfect healing machine – your own body. Your cells, your mind, and your spirit were designed to heal. This book will teach you to reclaim the energy, clarity, and freedom you were designed for.

Trade confusion, fear, and symptom-chasing for a clear, grounded understanding of how your body actually works. Drawing on decades of medical experience, thousands of patient stories, and the simplicity of the Root Causes Medicine framework, Dr. Derek Guillory helps you:

• See the true origins of disease. Understand how deficiency and toxicity create every symptom, and why healing begins when you address both.
• Decode the signals your body has been giving you. Fatigue, pain, brain fog, gut issues, inflammation, anxiety, or chronic diagnoses no longer feel mysterious or random.
• Reconnect with the innate intelligence of your biology. Discover how your cells repair, regenerate, and adapt when given the environment they were designed for.
• Recognize the emotional and spiritual patterns shaping your health. Learn how stress, thoughts, beliefs, and unresolved emotional trauma influence the physical body.
• Create a life that supports healing instead of working against it. Build environments, relationships, and daily practices that reduce your toxic load and restore your energy.
• Shift from fear to power. Understand your body with compassion and clarity so you can finally trust your path, your choices, and your healing.

Whether you’re navigating chronic symptoms that no one has been able to explain, or simply craving a more empowered and truthful approach to health, The Two Causes of All Disease offers a simple, profound way forward—one that brings hope, clarity, and real possibility back into your life.

Derek Guillory, MD

Derek Guillory, is a physician, teacher, and founder of Root Causes Medicine whose life’s work is built on a simple but radical belief: the human body is designed to heal. For more than two decades, he has helped patients who were told they were “mysteries,” “complicated,” or “incurable” finally understand what is driving their symptoms, and reclaim the health they thought they had lost.

Dr. Guillory’s career began in traditional medicine, but his curiosity, compassion, and personal health struggles pushed him to look deeper. After years of battling his own unexplained symptoms, he discovered what he now teaches thousands of people: every disease can be traced back to two causes, deficiency and toxicity, and when you address them, the body does what it was created to do. It heals.

His approach blends science, story, and spirituality. He weaves together biochemistry and belief, genetics and environment, trauma and biology, helping people see not only how they got sick, but why their suffering never meant their bodies were broken.

Known for his warmth, clarity, and unwavering hope, Dr. Guillory has become a trusted voice for anyone who feels lost in the medical system. His work is rooted in deep listening, genuine partnership, and an unshakeable conviction that healing is possible.

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