Loss of appetite can have various causes, ranging in severity from 'troubling' to 'very serious'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose loss of appetite, we could:
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Have you lost your appetite suddenly within the past 4 weeks?
Possible responses:→ I lost it more than 4 weeks ago / don't know
→ No, my appetite is fine
→ Yes, but it has now returned
→ Yes, 2-4 weeks ago and it has not returned
→ Yes, under 2 weeks ago and it has not returned