I feel it in my fingers, I feel it in my toes.
Talking of unspecified and undiagnosable illnesses. I get pains in my back from time to time that would ordinarily be written off as the onset of arthritis.
Which it probably is.
Except in my case I just happened to be studying the effect of the moon on the weather when I noticed several odd coincidences.
I get leg cramps when there are tornadoes in the USA and I get a stiff neck when there are earthquakes in the Fiji/Tonga/Vanuatu region.
I don't have an explanation for this. But I suppose that there is a similarity found in all sufferers of joint pain from rheumatoid arthritis to all sorts of other illnesses such as for example gout.
So if you know of anyone prone to said illnesses, you might want to look at what sort of things are going on earth wide at the time. It won't stop the pain. But it will be interesting. And give the sufferers a time window for release.