Which option represents a method for diagnosing diseases before they become severe?

Screening is a vital method for diagnosing diseases before they progress to severe stages. This approach involves systematic tests and examinations conducted on populations or individuals who may not yet show symptoms of a disease. By identifying potential health issues early, screening facilitates timely intervention, which can significantly improve treatment outcomes and reduce the risk of complications related to the disease.

For example, screening programs for conditions like diabetes, certain cancers, and infectious diseases enable healthcare providers to detect these issues at manageable stages, thereby allowing for preventative measures and early treatment strategies. The focus of screening is on prevention and early detection, contrasting with options that revolve around addressing problems once they occur or after symptoms manifest.