Little people that live inside and feed off of human beings' kidneys. They create colonies and families and once all the kidneys have been used up and eaten, they move on to the next victim. Kidney stones are the byproduct of these little people's waste. Once you die they are excreted out of your body.
Martha Monroe was diagnosed with this debilitating condition in 1987. She went to her doctor complaining of pains in her kidneys. Both Martha and her doctor believed that it was just a kidney infection. Unfortunately she found out later that it actually was Parum Kidney Populus, a.k.a Little Kidney People.