How are there only 60 officially recorded cases? What are the POISers and doctors doing? No one who went to doctors for POIS asked for them to be officially diagnosed to be added to that list? Such outdated stats are why some when researching POIS may not accept they have it or nonPOISers dismiss it cuz it makes it seem like it's some ultra rare issue
How the official diagnosis works and how is that list made?
If you had taken the time to investigate a bit, you may have found your answers. This Google alert is from a local, low-quality health newsreel, and on top of that, badly quotes another low-quality health newsreel or badly quotes the original newsreel at the source of those 2 posts. In fact, in the initial low-quality article, it was said "at least 60 known cases", as they may have deducted from the cases reported in medical literature, but it was badly quoted in the local health newsfeed in Queensland, Australia, which changed it to "fewer than 60 known cases". The original is at
https://www.insider.com/black-hairy-tongue-vitamin-d-overdose-flu-symptoms-sex-2022-12 , second paragraph. This short article does not cite any sources. It is clear that it is a cheap freelancer column-filling article. So, stay calm, nothing to worry about here. Just an article that was written in a hurry by an unknown freelancer, in order to make some bucks. Do you think all internet websites are serious, can be trusted, and have medical expert reviewers for their health column?
You should stick the articles in Muon's list, in the POIS paper archive, at
https://poiscenter.com/forums/index.php?topic=3127.msg31515#msg31515 . More often than not, Google alerts for POIS point to substandard articles published by non-scientific writers who just want to showcase the "weird" and rare aspect of POIS.