In this introductory chapter, I will introduce the concept of affective injustice and how it will be used in this book. I define affective injustice in healthcare as those norms and practices that seek to minimize, hide, and silence affects. In this book, I will specifically be interested in how affective injustice happens to and affects healthcare providers, patients, and families. In this introductory chapter, therefore, it is necessary to first discuss how the concept is related to the concept of epistemic injustice and why the word injustice has been chosen to discuss this controversial subject. I will also introduce the key terms that will be used throughout this book, in particular affective related testimonial and hermeneutical injustice, affective harms, and affective silencing. I will also introduce terms that work toward affective injustice, including affective humility, affective resources and opportunities, affective freedoms, and affective recognition. This introductory chapter will prepare for the next two chapters to follow, which will discuss the affective harms experienced by healthcare providers and patients.