The answer is "nothing" The only common factor between these patients is Dr. Marrero. It is notable that he is not the only physician who works in that clinic, but is the only one diagnosing this condition. The most likely cause is weak diagnostic skills for challenging patients. Unfortunately, a majority of these patients likely have Functional Neurologic Disorder https://www.mayoclinic.org/diseases-conditions/conve…
> The committee and the New Brunswick government also cast doubt on the work of neurologist Alier Marrero, who was initially referred dozens of cases by baffled doctors in the region, and subsequently identified more cases. The doctor has since become a fierce advocate for patients he feels have been neglected by the province. https://www.theguardian.com/world/article/2024/jun/03/canada... It seems to me that it's do…
This happens a lot in medicine: One doctor becomes locally renowned for taking in patients with hard-to-diagnose issues and giving them answers, right or wrong. Other doctors take note and then start offloading their difficult patients to other doctors happy to take them in.
It happens all the time with different doctors. Once they find a niche, they start diagnosing everyone with the same thing. A common theme is that their patients don't get better, but are happy to have someone give them a diagnosis.
In the scarier cases, it's surgeons doing this. There have been some sad periods in medicine where certain doctors starting performing unnecessary surgeries on everyone who visited them with vague symptoms. These doctors are scarily popular in a certain type of Facebook health group where patients congregate looking for answers and, lo and behold, some doctor or surgeon becomes their hero with a supposed answer to all of their questions. It usually goes on for several years before everyone realizes that nobody is getting better from these doctors and nobody ever gets rejected for a diagnosis when they visit that doctor.