Fewer will give faster searches, but will limit potential results.
Targetted findings (select ) will limit the search to only that exact symptom (or subcategories of that symptom). For example, targetted search with "abdominal pain (left upper quadrant)" will not include diseases containing the more general "abdominal pain" symptom.
    By adding current comorbid diseases, complications from these diseases (that could explain the above findings) will be appropriately presented as more common in the differential.