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overtreatment

(OH-ver-TREET-ment)
Unnecessary treatment for a condition that is not life-threatening or would never cause any symptoms. Overtreatment may lead to problems and harmful side effects. Overtreatment can be a result of overdiagnosis, which occurs when a cancer screening test finds a lesion that would have gone away on its own or not caused problems.
Search NCI's Dictionary of Cancer Terms