Physicians working in the field of occupational medicine need to be aware of occupational health hazards and diseases to better practice and prevent occupational-related diseases and injuries. Bentham Science Publishers has recently published an eBook, Introduction to occupational health Hazards, edited by Farhana Zahir. This book includes six chapters. Chapter 1 provides a brief overview of occupational hazards at work and their related occupational diseases. By reading the introduction, we learn about history, definition and importance of occupational diseases. The occupational diseases are then classified into six groups; diseases caused by biological, chemical, physical, ergonomic, and psychological agents, and accidents. The authors then explain the most common and most important causes of diseases for each group. Considering the extent of occupational exposures and diseases, this chapter could achieve its goal to provide the main idea to readers to a large extent....