Minimosis, also called Wonderlittle and Mic, is a condition in which a character becomes about the size of a kitten. Not much is known about it, except for the fact that the person's voice is squeaky, and even with their new sense of flexibility(in some cases, agility and/or stamina), they're as fragile as a mouse.
This isn't to say that there aren't characters who aren't already this size, and it is for that reason that this is considered a condition rather than a disease; it's been categorized as such due to its effect on those who normally aren't this size.
The polar opposite of this condition is Arafosis.
The only known cure is to ask a chairman.