Earlier quoted context omitted.
Yes, this has happened to several family members in the US, though thankfully mine was diagnosed properly because I could point to family history. Initially they wanted to write it off to migraines (I can't blame them since it's more common and can have similar symptoms at first) and now nine years later it's painful to use my hands and I've mostly given up martial arts. It would almost certainly be worse if I hadn't…
One of the doctors took them seriously, did a biopsy, and gave them a diagnosis. They did not like their diagnosis because “idiopathic” means “we don’t know what causes this,” which the patient translated as “go the fuck away.” As if all human disease is deeply understood and an admission of ignorance is equivalent to laziness. They then continued going to additional doctors.
It doesn't change the fact that, as a patient, an idiopathic diagnosis is not a satisfying outcome if it doesn't point to a course of treatment. And it's certainly not something I view as a "final diagnosis" -- I'm patient, and technology and medicine are still improving and I hope it'll be possible to identify the cause and treat it in the future.