This book analyses the concept of disease, as defined in the context of evolutionary medicine. Upon introducing the reader to evolutionary medicine in its current form and describing its approach to disease instances, the book leverages thoughts and instruments of knowledge of epistemology, social sciences, and ethics to answer the question: "How can we build a timely and appropriate concept of disease?" At first, it looks at the social concerns of medicalization, for example focusing on the suffering of people who have not been diagnosed, or whose suffering is not caused by certain elements that falls under the definitions of disease. In turn, it merges different, both conceptual and empirical considerations in one comprehensive analysis, with the aim of fostering a multidisciplinary understanding of the phenomenon of disease. This book also highlights certain kinds of epistemic injustices that are taking place in the healthcare system, as this is currently conceived in post-industrial societies, thus offering a timely contribution to the current debate around social justice in healthcare.