Read the passage below. Detecting disease earlier is often beneficial, but a screening program can find abnormalities that would never cause symptoms. A highly sensitive thyroid scan identified many tiny growths and sharply increased diagnosis rates. Mortality from thyroid disease did not fall, while thousands of patients underwent surgery for lesions later judged unlikely to progress. The example does not show that all screening is harmful; it challenges the stronger assumption that more detection necessarily means better health outcomes. Which statement best captures the general claim and the role of the thyroid-screening example?