Which question best assesses onset when evaluating a new symptom?

• A. What were you doing when this happened?
• B. How long have you had symptoms?
• C. Do you have a fever?
• D. Have you eaten today?

Answer: (A)

Onset focuses on when the symptom began and what the patient was doing at that moment. Asking what you were doing when this happened directly targets that exact moment, helping identify what triggered the symptom and how quickly it appeared. This timing is crucial for deciding the appropriate management path, such as recognizing sudden-onset events like chest pain or neurological symptoms that may require rapid intervention.

Asking how long the symptoms have been present tells you duration, not the precise start time. Inquiring about a fever looks for associated signs of infection, and asking about meals checks for recent intake—neither directly pinpoints when the symptom started. So the question about what you were doing at the onset best assesses onset.