Podcast Summary

Podcast: The Art of Manliness
Host: Brett McKay
Guest: Dr. Susannah Sullivan, Neurologist
Episode: Overdiagnosed — How Our Obsession with Medical Testing and Labels Is Making Us Sicker
Release Date: September 8, 2025

Overview

This episode explores the theme of "overdiagnosis"—how our increasing reliance on medical tests and hunger for medical labels may be making people less healthy, more anxious, and overly medicalized. Neurologist Dr. Susannah Sullivan joins host Brett McKay to discuss her book The Age of Diagnosis: How Our Obsession with Medical Labels Is Making Us Sicker. The conversation unpacks how advances in medical tests, shifting definitions of normal, and a culture craving diagnosis are creating new problems for patients.

Key Discussion Points & Insights

What is Overdiagnosis? (03:19–06:23)

• Definition Nuance: Overdiagnosis does not mean someone has no problem. It refers to either:
  • Overdetection: Identifying diseases or abnormalities that would never cause harm if left undetected or untreated.
  • Overmedicalization: Applying medical labels to common life struggles or normal variations, potentially causing more harm than benefit.
• Quote:

  “Over diagnosis doesn’t mean that a person doesn’t have a problem, but it’s asking the question whether referring to that problem as medical—is that really the right thing to do?”
  — Dr. Sullivan (05:16)

Diagnostic Process: Art vs. Science (06:23–10:40)

• Layperson Misunderstanding: Many view diagnosis as purely a technical test. In reality, diagnosis remains a clinical process—tests supplement a doctor’s judgment; they don’t determine it.
• Incidental Findings: The more tests, the more “incidentalomas” are found—abnormalities that are benign and common, especially as we age.
• Quote:

  “By the time you get into your 50s, about 50% of people have an abnormality on their MRI scan.”
  — Dr. Sullivan (09:32)

Shift from Clinical Art to Test Dependence (10:40–14:20)

• Generational Difference: Older doctors trained before high-tech tests rely more on patient history and physical exams, while many younger doctors lean heavily on tests, sometimes to the patient’s detriment.
• Patient Story (Brett): Changing from an older to a younger GP, Brett observed more test-driven, less context-aware care, which caused unnecessary anxiety.
• Quote:

  “The good doctor isn’t the doctor who, every time you tell them you have a pain or ache somewhere, they do a test... The good doctor is the one who listens to you and understands when to do tests and when not to do tests.”
  — Dr. Sullivan (13:33)

When is a Diagnosis Useful? (14:20–16:34)

• Clinical Judgment: Not all test results should be shared if they are uncertain and might cause undue anxiety.
• Ethical Dilemma: Should doctors share ambiguous results (like genetic variants of “uncertain significance”), or is it more harmful than helpful?

Disease Categories and Overdiagnosis

Cancer & Screening Paradoxes (16:34–28:55)

• Actual Increases vs. Overdetection: Cancer rates (for symptomatic cases) are increasing, but screening leads to large numbers of non-threatening cancers being detected and often aggressively treated.
• Survival Statistics Trap: Treating non-dangerous cancers inflates survival stats without necessarily improving actual life expectancy.
• Quote:

  “If you over diagnose people with cancer and you treat too many people... you will make cancer survival statistics look a lot better than they actually are.”
  — Dr. Sullivan (21:35)

• Prostate Cancer Example: PSA screening saves a few lives but leads to unnecessary anxiety and invasive procedures for many.
• Quote:

  “For every cancer diagnosis through all of this availability of technology, 10 probably weren’t necessary.”
  — Dr. Sullivan (34:12)

Differences in Medical Culture (33:25–35:50)

• US health model incentivizes more screening; single-payer systems like the NHS may protect patients from excessive, unnecessary testing due to less commercial motivation.

Shifting Disease Definitions: Diabetes & Hypertension (35:50–44:40)

• Diagnostic Boundaries: Lowering thresholds for prediabetes and hypertension has massively increased the number of labeled patients—yet with limited evidence that this improves health outcomes.
• Quote:

  “Kind of you’re sitting at home minding your own business… and meanwhile, somewhere in the background, a committee is convened and deciding… what counts as normal glucose. And on a Monday, they change it. And suddenly you are no longer healthy.”
  — Dr. Sullivan (37:20)

• No Clear Population Health Benefit: Dramatically more people are labeled as "at risk" without benefit to overall rates of disease prevention.

Lyme Disease & Diagnosis Demand (44:40–49:37)

• Diagnostic Overuse: Lyme disease, while having robust diagnostic criteria, gets overdiagnosed due to nonspecific, common symptoms and loose (sometimes financially motivated) testing practices.
• Astonishing Global Overdiagnosis: Instances of Lyme diagnoses in Australia, where the bacterium doesn’t exist, illustrates the dangers of overtesting.
• Quote:

  “A specialist Lyme disease clinic… determined that 85% of the people who thought they had Lyme disease did not have Lyme disease.”
  — Dr. Sullivan (47:57)

Psychosomatic Symptoms & Label Clustering (49:37–54:33)

• Many chronic, unexplained symptoms might be rooted in psychological stress, but our culture prefers physical disease labels, sometimes worsening the problem via the nocebo effect.
• Quote:

  “Once you’re given a medical diagnosis, it can have… a nocebo effect. So this is where… if you believe something will make you sick, it can make you sick.”
  — Dr. Sullivan (52:33)

Rising Mental Health Diagnoses (54:33–60:37)

• Unpacking the Increase: Some data suggest real rises in distress among young people, but overdiagnosis of conditions like ADHD and autism is rampant.
• Population vs. Individual Impact: While awareness and support are positive, seeing adolescent norms as medical disorders may actually increase long-term suffering.
• Quote:

  “You have to say that there is an over diagnosis of conditions like ADHD and autism… It seems… framing their problem through these lenses has not resulted in healthier and happier adults.”
  — Dr. Sullivan (56:20)

Thoughts on Solutions & Takeaways

The Role of Slow Medicine (62:01–63:34)

• Empowerment: Most diagnoses are not urgent; patients and doctors should take time to weigh information.
• Self-Assessment Before Testing:
  • What will you gain from a diagnosis?
  • What might you lose (anxiety, stigma, treatment risks)?
  • Is the potential benefit worth the risk?
• Quote:

  “We should be creating a system of more slow medicine… Sometimes the scan that you have to relieve your anxiety can actually cause more anxiety.”
  — Dr. Sullivan (62:25)

Notable Quotes & Memorable Moments

| Timestamp | Quote & Speaker | |-----------|----------------| | 05:16 | “Overdiagnosis doesn’t mean that a person doesn’t have a problem, but it’s asking the question whether referring to that problem as medical—is that really the right thing to do?” — Dr. Sullivan | | 09:32 | “By the time you get into your 50s, about 50% of people have an abnormality on their MRI scan.” — Dr. Sullivan | | 13:33 | “The good doctor isn’t the doctor who, every time you tell them you have a pain or ache somewhere, they do a test... The good doctor is the one who listens to you and understands when to do tests and when not to do tests.” — Dr. Sullivan | | 21:35 | “If you over diagnose people with cancer and you treat too many people... you will make cancer survival statistics look a lot better than they actually are.” — Dr. Sullivan | | 34:12 | “For every cancer diagnosis through all of this availability of technology, 10 probably weren’t necessary.” — Dr. Sullivan | | 37:20 | “Kind of you’re sitting at home minding your own business… and meanwhile… a committee is convened and deciding… what counts as normal glucose. And… suddenly you are no longer healthy.” — Dr. Sullivan | | 47:57 | “A specialist Lyme disease clinic… determined that 85% of the people who thought they had Lyme disease did not have Lyme disease.” — Dr. Sullivan | | 52:33 | “Once you’re given a medical diagnosis, it can have… a nocebo effect. So this is where… if you believe something will make you sick, it can make you sick.” — Dr. Sullivan | | 56:20 | “You have to say that there is an over diagnosis of conditions like ADHD and autism… It seems… framing their problem through these lenses has not resulted in healthier and happier adults.” — Dr. Sullivan | | 62:25 | “We should be creating a system of more slow medicine… Sometimes the scan that you have to relieve your anxiety can actually cause more anxiety.” — Dr. Sullivan |

Important Segments & Timestamps

• Introduction to Overdiagnosis: 03:18–06:23
• Diagnostic Process & Test Context: 06:23–10:40
• Cultural Shifts in Medical Testing: 10:40–14:20
• Screenings and Cancer Risks: 16:34–28:55
• National & Systemic Healthcare Differences: 33:25–35:50
• Changing Definitions: Diabetes & Hypertension: 35:50–44:40
• Lyme Disease Overdiagnosis: 44:40–49:37
• Mental Health Labels: 54:33–60:37
• Patient Empowerment & Slow Medicine: 62:01–63:34

Final Thoughts

Dr. Sullivan urges patients and physicians alike to slow down, question the reflex to label every variation as disease, and weigh the real-life costs and benefits of medicalizing ordinary experiences. The episode is a thought-provoking critique of modern medicine’s overzealous use of labels and tests—a must-listen for those who want to be savvier, more empowered patients.

Resources

• Dr. Susannah Sullivan, The Age of Diagnosis: How Our Obsession with Medical Labels Is Making Us Sicker
• More: Art of Manliness Show Notes