The most important element in disasters is people. For that reason, health is one of the most critical sectors in terms of disaster preparedness and damage reduction as well as response and recovery activities. This study discusses the concepts of disaster medicine (DM) and disaster health under the term of DM and addresses some of the foremost studies in DM historically. Further, it explains the concept, importance, and features of the concept of DM. Lastly, this study reflects on public health, emergency medical services, definitive treatment centers (hospitals and other health facilities), which are the components of DM, in relation to disasters. It also provides the case studies of some countries on DM.