This happens to me this morning. When I ask about whether my legs are having lymphatic congestion or varicose veins, because the symptom of both two I read on the internet are similar, the answer the doctor said is "I don't know". He gave me some drugs, and said that if it doesn't get better, he will arrange an experiment.
I understand that symptoms are hard to tell exactly, but I also want to learn more. Of course I know that questions where the answer is clearly 'see a doctor' are not encouraged, but what if the doctor says: "I don't know"?
- accept those questions if it is clearly state the doctor doesn't know (and encourage the OP to ask how they will handle this if possible)?
- close the question with the reason: "see another doctor"?