Defining health and public health

What is health? How is it defined and described? What do you mean when you describe yourself as ‘healthy’? How is ‘public health’ defined? What are the fundamental principles of public health? How does public health interact with other disciplines? And how do we describe what public health workers do? These are many of the questions that will be considered in this chapter and other chapters, which are designed to help you become familiar with the principles and practices of public health. This book is about introductory principles and concepts of public health for students. It is also relevant for health workers from a range of disciplines whose focus ranges from clinical to population health, and who want to understand and incorporate public health principles into their work. We begin our journey by considering a fundamental issue that underpins the notion of public health—that is, the definition of ‘health’, and we consider the range and variety of definitions, including the general public and professional.