To diagnose something too frequently, or based on insufficient evidence(noun)
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Use "overdiagnosis" in a sentence
"And those include the possibility of having false positive tests, the need for having to go back for repeated X-rays and more tests, as well as additional biopsies that ultimately are not necessarily -- and also a problem we call overdiagnosis, which means that identifying cancerous lesions that in fact, are very, very limited and for reasons that we don't fully understand don't progress to become invasive cancer and that otherwise would be fine if left untreated."
"Work is under way to better predict that, and even the staunchest supporters of screening call overdiagnosis a problem that needs tackling."
"And in some cases, early detection means doctors diagnose and treat cancers that would never have caused any harm if left alone -- a phenomenon known as overdiagnosis."