Click through to the Facebook post and you'll find speculation that these nosebleeds have followed an "unconfirmed report" of a radioactive plume released from Fukushima on September 20.
Well, this is very exciting, and when ENE News posts items about a Japanese government coverup, it gets even more exciting. Search ABYZ News for Japanese mainstream media in English, and "nosebleeds" gets zero hits. Could this be genuine crowd-sourced digital disease detection?
We know governments are sometimes capable of maintaining silence on embarrassing outbreaks, as in Cuba, and the Soviets certainly tried to keep Chernobyl quiet. But that seems hard to imagine in a country with as lively and competitive a media as Japan's.
Moreover, a summary of the symptoms of radiation sickness does not list nosebleeds among them. Most of those complaining of the problem seem to be under the age of 30, which might be explained by young people's greater use of Twitter. But we don't know where the tweeters live or whether they have been downwind of Fukushima since September 20.
And it strains credulity (mine, anyway) to imagine that a major radioactive plume could be released over Japan without the whole world knowing about it very quickly. And even the dumbest government would know what happened after the Chernobyl coverup.
Perhaps the nosebleeds reflect some outbreak of unknown origin, and the phenomenon deserves to be investigated. But I really don't expect, on the evidence presented so far, that Fukushima is the source of the problem.