Man's immediate environment is a nest of many living creatures seeking to feed on dead skin, sweat, blood, flesh and human excrement. Some of these creatures live in symbiosis with man, but the majority are harmful to our health. In addition to infectious diseases, transmissible diseases such as cardiovascular disease, diabetes mellitus and hereditary diseases also affect human health. Research carried out in a number of sub-Saharan African countries shows in this book that the causes of disease are the same sources that overwhelm the African population. Hospitals are overcrowded with patients, and through ignorance these illnesses are attributed to supernatural beings or sorcerers.This book is more detailed, with case studies to help us understand the origins of the ailments that plague us. Written in easy-to-understand French, the aim of this book is for every family to appropriate it for the education of children, young people and adults in the family and even at school for prevention. "Prevention is better than cure, as the saying goes".