Emergency management (also Disaster management or Emergency Preparedness) is a science and a system charged with creating the framework within which communities reduce vulnerability to hazards and cope with disasters. Emergency management, despite its name, does not actually focus on the management of emergencies; emergencies can be understood as minor events with limited impacts and are managed through the day-to-day functions of a community. Instead, emergency management focuses on the management of disasters, which are events that produce more impacts than a community can handle on its own. The management of disasters tends to require some combination of activity from individuals and households, organizations, local, and/or higher levels of government. Although many different terminologies exist globally, the activities of emergency management can be generally categorized into preparedness, response, mitigation, and recovery, although other terms such as disaster risk reduction and prevention are also common. The outcome of emergency management is to prevent disasters and where this is not possible, to reduce their harmful impacts.

Emergency planning aims to prevent emergencies from occurring, and failing that, initiates an efficient action plan to mitigate the results and effects of any emergencies. The development of emergency plans is a cyclical process, common to many risk management disciplines, such as business continuity and security risk management, wherein recognition or identification of risks as well as ranking or evaluation of risks are important to prepare. Also, there are a number of guidelines and publications regarding emergency planning, published by professional organizations such as ASIS International, National Fire Protection Association (NFPA), and the International Association of Emergency Managers (IAEM).

Emergency management plans and procedures should include the identification of appropriately trained staff members responsible for decision-making when an emergency occurs. Training plans should include internal people, contractors and civil protection partners, and should state the nature and frequency of training and testing. Testing a plan's effectiveness should occur regularly; in instances where several businesses or organizations occupy the same space, joint emergency plans, formally agreed to by all parties, should be put into place.

Safety drills are often held in preparation for foreseeable hazards such as fires, tornadoes, lockdown for protection, and earthquakes, with the participation of both emergency services and people who will be affected. In the U.S., the Government Emergency Telecommunications Service supports federal, state, local and tribal government personnel, industry and non-governmental organizations during a crisis or emergency by providing emergency access and priority handling for local and long-distance calls over the public switched telephone network.

Cleanup during disaster recovery involves many occupational hazards. Often, these hazards are exacerbated by the conditions of the local environment as a result of the natural disaster. Employers are responsible for minimizing exposure to these hazards and protecting workers when possible, including identification and thorough assessment of potential hazards, application of appropriate personal protective equipment (PPE), and the distribution of other relevant information in order to enable the safe performance of work.

Flooding disasters often expose workers to trauma from sharp and blunt objects hidden under murky waters that cause lacerations and open and closed fractures. These injuries are further exacerbated with exposure to the often contaminated waters, leading to increased risk for infection. The risk of hypothermia significantly increases with prolonged exposure to water temperatures less than 75 degrees Fahrenheit (24 °C). Non-infectious skin conditions may also occur, including miliaria, immersion foot syndrome (including trench foot), and contact dermatitis.

Earthquake-associated injuries are related to building structural components, including falling debris with possible crush injury, burns, electric shock, and being trapped under rubble.

Chemicals can pose a risk to human health when exposed to humans in certain quantities. After a natural disaster, certain chemicals can become more prominent in the environment. These hazardous materials can be released directly or indirectly. Chemical hazards directly released after a natural disaster often occur at the same time as the event, impeding planned actions for mitigation. Indirect release of hazardous chemicals can be intentionally released or unintentionally released. An example of intentional release is insecticides used after a flood or chlorine treatment of water after a flood. These chemicals can be controlled through engineering to minimize their release when a natural disaster strikes; for example, agrochemicals from inundated storehouses or manufacturing facilities poisoning the floodwaters or asbestos fibers released from a building collapse during a hurricane. The flowchart to the right has been adopted from research performed by Stacy Young et al.