Our dependence on electromagnetic radiation includes transportation, communication, entertainment and health. Consequently electromagnetic fields interact with inner electromagnetism or tissue structures of living systems as human beings, promoting at the same time a great interest between biomedical and natural sciences while improving our knowledge to develop new and better diagnostic and therapeutic procedures. All kinds of biological and health effects concerning electromagnetic fields have also become a matter of public concern. According to the available scientific data from in vitro cell levers as well as animal and human at tissue level experiments, exposure to EM radiation is considered likely to be harmful to human health among other agents as chemicals and environmental pollution. This book aims to bring together basic knowledge including history and introductory mathematical approaches, combined with recent advances concerning radiation interaction with biological matter that includes occupational safety aspects from electromagnetic radiation. Students, researchers, as well as scientists of different fields who want a brief introduction and deep understanding of research approaches used could take advantage of starting their own path in studying the consequences of electromagnetic radiation on human health.