The author writes all his personal knowledge, experience, and 100 percent true information about demons, pains, and diseases in this book. The author suggested several practical ideas and theories for common people and medical science on how they can learn and handle by themselves, by using this and the next book about the invisible world of the demons, pains, and diseases. The author is 100 percent sure that after reading this and the next book, everyone will be aware and will be able to control the invisible parallel world around them. If people will be ready, the author believes that, in the next book, he will write clear instructions for individuals on how they can communicate with the demons around them, their friends, and how to ask demons to do some stuff for them. Author will describe in more detail how much stuff we can expect from our demons friends to do for us.