Preventive health screening: benefits and risks of overscreening
10 reported
A Guardian article published June 21, 2026, examines the balance between helpful preventive health screening and unnecessary testing. The article notes that as medical technology has become more marketable, the line between useful screening and overscreening has blurred. Experts quoted in the article define screening as testing for conditions before symptoms appear, with good examples including blood sugar tests and blood pressure checks. However, the article warns against overscreening, citing full-body MRI scans as a prime example where 95% of participants in one review had abnormal findings, but fewer than 0.5% were suspicious for cancer. The article also discusses harms of overscreening, including incidentalomas that trigger additional testing, biopsies, and specialist appointments, as well as worry and a sense of ill health. It advises consulting primary care clinicians before signing up for direct-to-consumer tests, as the FDA does not review all such tests.
What’s reported
The article was published by The Guardian on June 21, 2026.
Screening is defined as medical testing that looks for conditions before symptoms appear.
Good screening tests find treatable conditions early and do not cause harm.
Blood sugar tests and blood pressure checks are cited as examples of great screening tests.
Full-body MRI scans are described as a nearly perfect example of overscreening.
In one review of whole-body MRI screenings, 95% of participants had abnormal findings, about a third required further investigation, and fewer than 0.5% had findings suspicious for cancer.
Incidentalomas are tiny cysts, nodules, or anatomical quirks of unclear significance.
Harms of overscreening include additional testing, biopsies, specialist appointments, cost, time, discomfort, medical complications, and worry.
The FDA does not review all direct-to-consumer tests.
The article advises consulting primary care clinicians before signing up for trending screening tests.
Key figures
Bryan Johnson, tech entrepreneur and longevity influencer (mentioned in opening anecdote)
Gilbert Welch, researcher of overdiagnosis at Brigham and Women’s Hospital in Boston
Suzanne O’Sullivan, neurologist at London’s National Hospital for Neurology and Neurosurgery
Sources: The Guardian
