This book is a scientific and universally popular science and health reading book. It is compiled by popular science and health experts. It mainly introduces the prevention and self-treatment of common diseases; the methods of health maintenance for people of different age levels and different physical fitness categories; Four Seasons Health maintenance knowledge and introduction to health maintenance methods such as diet, emotions, exercise, and daily life. The book is divided into children's, adults, seniors, and other chapters. It is presented in the form of text and pictures, with pictures and texts, and easy to understand.