Anti-yukkuritis, or "un-easy sickness", is a lethal disease for yukkuris.
Yukkuris will be possible to develop anti-yukkuritis when they are fallen into deep depression, overwhelmingly stressed, or left with serious psychological trauma. The most common cause is a yukkuri that saw their entire family killed in front of their eyes.
Yukkuris who developed anti-yukkuritis will enter a mentally-dead state. They will stop all their common living actions like moving, wiggling bottoms, doing rub-rub or stretch-stretch, eating food, excreting, sleeping, mating, and others.
All they will do are expressing a mad, dull, and retarded face and crying "Easy" repeatedly.
They will no longer react to external stimulation such as greeting "Take it easy", doing rub-rub, or even beating.
Tears, saliva, urine and faeces will come out without control.
Unable to eat anything, the sicked yukkuris will die of starvation in a short time.
In some works, pre-anti-yukkuritis (when a yukkuri is about to go crazy but not yet) can be prevented by an orange juice or vaccine injection (e.g. post #66896) or by them seeing/remembering something that strengthens their mind (e.g. post #69431)
An anti-yukkuritis vaccine exists to prevent anti-yukkuritis. It's mainly used for yukkuris that will be exposed to extreme stress but we don't want them to die (e.g. compost yukkuri).
The tag should be used when yukkuris develop such a disease.
Madness is similar to this tag but is different (see madness wiki page for details)