Toxic: Heal Your Body from Mold Toxicity, Lyme Disease, Multiple Chemical Sensitivities, and Chronic Environmental Illness by Dr. Neil Nathan offers a thorough, clinician‑guided look at how environmental toxins and complex infections can trigger chronic, hard‑to‑diagnose health problems.

Drawing on decades of experience helping patients whose symptoms were often dismissed, Nathan explains how extreme sensitivity and toxic buildup develop in the body and outlines five major contributors including mold exposure, Lyme co‑infections, mast cell activation, porphyria, and carbon monoxide poisoning.

The book also presents the cell danger response model to help readers understand why the body can remain stuck in chronic illness, and provides a system‑by‑system framework for identifying causes, reducing toxic load, supporting recovery, and coping with stress and emotional challenges.

It is both a resource for sufferers and a guide for their families and healthcare providers seeking effective approaches to healing