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In page Chief complaint:

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When obtaining the chief complaint, medical students are advised to use open-ended questions.[4][5] Once the presenting problem is elucidated, a history of present illness can be done using acronyms such as SOCRATES or OPQRST to further analyze the severity, onset and nature of the presenting problem. The patient's initial comments to a physician, nurse, or other health care professionals are important for formulating differential diagnoses.[citation needed]