Is this a reasonable line of logic?

Say a person with no medical background makes up a medical condition that is clearly not possible, and in fact is so absurd and that no medical professional would even considered it, much less ever bother to make a study on it. Now say that person insists that unless someone can show them the medical source that says the condition isn't real, then it must be real.

Is that a logical line of reasoning?
Yes that is logical
Im not sure
No that is silly
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I agree that it could be some sort of mental thing. But that would still fall under mental cases that are already known and existing. My only point is that lack of squats in and of itself will not cause a headache.
Is this a reasonable line of logic?
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