Complex emergencies usually involve situations where the population suffers from accidents and loss of property, basic services and livelihoods as a result of war, civil strife or other political conflicts on the alarming rise in the world. In many of these cases people are forced to leave their homes temporarily or permanently, others become refugees in other countries. In technological disasters, large numbers of people are directly affected by severe incidents, major industrial accident of pollution, unplanned nuclear downloads, large fires, explosions of hazardous substances, etc. There is a connection that always must be taken into account between natural disasters and man-made, that can trigger secondary disasters caused a fire after an earthquake, environmental contamination after a flood that deepen individual and community vulnerability. There are factors that contribute to the occurrence and severity of disasters and their consequences in developing countries: poverty and social inequity. Unequal access to basic services and health services. Environmental degradation by misuse of land.
Rapid growth of the population without adequate family or urban planning measures. Disasters and health currently have enough information about the causes and nature of disasters, and at-risk populations. This knowledge allows us to foresee some of the effects of the disaster on the health of affected communities from the perspective of health, disasters are defined by its effect on well-being biopsychosocial of persons to the health implications of disasters go much beyond what you reveal the conventional indicators on deaths and injuries, and their impact are not only those considered initially. When disrupting services, water and sanitation or large numbers of people remain homeless. in the medium and long term risks may include a range of disorders and diseases like malnutrition, communicable diseases and mental disorders. Accordingly, the health sector must participate multisectoral processes of planning, execution, and evaluation of risk with regard to disaster management. Health, disasters and development.