I'm also prone to iron deficiency anemia of unknown etiology (cause), but that's another problem suggesting either poor absorption (most likely), cancer, or unexplained bleeding.
Or undiagnosed parasitic infection. They scavenge iron and some hide from the immune system by changing their protein markers.
I don't know where you are, but American doctors tend to not test for them. "Third World Problem. Nothing we need to worry about."
And we don't keep stats on them because "Third World Problem. Nothing we need to worry about." so we don't actually know how prevalent they are.
And yet, there was a huge interest in anti-parasite medication during the panny-D, lol.
That said, these "third-world problems" - by which I think you mean things like parasites, curable / preventable / vaccinatable diseases, "tropical" diseases, and mosquito-borne diseases - are becoming more and more prevalent in the US and Europe because of climate change and other factors - I'm thinking poor health care, aging infrastructure (think Flint), shortcuts (think the UK dumping sewage into the sea because their infrastructure can't handle processing), but also evolution, things like parasites being able to survive better.
Or undiagnosed parasitic infection. They scavenge iron and some hide from the immune system by changing their protein markers.
I don't know where you are, but American doctors tend to not test for them. "Third World Problem. Nothing we need to worry about."
And we don't keep stats on them because "Third World Problem. Nothing we need to worry about." so we don't actually know how prevalent they are.