A condition where a yukkuri's shit becomes watery and causes them to shit more often and with higher quantities. Diarrhea isn't a disease but rather a symptom of an underlying disease which in yukkuris are usually mold, anti-yukkuritis or poisoning.
A potentially fatal condition that can cause death via dehydration in humans. And on yukkuris it's even more deadly as they have no multiple organs separating their body like a human. Their anyaru is directly connected to their paste reserve and such they literally shit out their entire insides and die from excreting their paste core. Koyukkuris in particular have way less paste than adults and dies much quicker.