Overdiagnosed — How Our Obsession with Medical Testing and Labels Is Making Us Sicker

Modern medicine has given us incredible tools to peer inside the body and spot disease earlier than ever before. But with that power comes a problem: the more we look, the more we find — and not everything we find needs fixing.

My guest today, neurologist Dr. Suzanne O'Sullivan, argues that our culture of over-diagnosis is leaving many people more anxious, more medicalized, and sometimes less healthy. In her book The Age of Diagnosis: How Our Obsession with Medical Labels Is Making Us Sicker, she explains how screening tests, shifting definitions of “normal,” and the rise of mental health labels can turn ordinary struggles or idiosyncrasies into problems in need of treatment. We dig into everything from cancer and diabetes to Lyme disease and ADHD and discuss how diagnosis really works, why screening can sometimes harm as much as it helps, and how to know when a label is and isn't useful.

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