Final answer:
When asking about severe flank pain, an appropriate question would be whether the pain is constant or intermittent. This information helps determine possible causes of the pain such as kidney stones or muscle strains.
Step-by-step explanation:
When asking about the nature of the severe flank pain, it would be appropriate to ask whether the pain is constant or intermittent.
This information is important in determining the possible causes of the pain. For example, if the pain is constant, it could indicate a serious condition such as kidney stones or a urinary tract infection. On the other hand, if the pain is intermittent, it could be a sign of conditions like muscle strains or spasms.