Health is an eternal topic for mankind. It is also the prerequisite for people's normal life and work, and it is also the basis for happiness. Due to the lack of health knowledge, many people persist in wrong lifestyles and habits for many years, causing their health to be damaged bit by bit, and even their lives lost to diseases. If we have more health knowledge and less ignorance, many diseases can be avoided. Therefore, it is necessary to popularize science and promote correct health knowledge. This book is a living tool for home use. It introduces nearly a thousand must-know health knowledge, aiming to help readers get rid of health misunderstandings and establish a scientific concept of health. It has the characteristics of concise format, rich content, scientific and practical, simple and fast, truly making it possible to know all the health knowledge in one volume.