Millions of people have been directly affected by disasters, and yet the vast majority of them recover due to the resilience of human nature. At the same time, many of those people will develop psychological disorders such as major depression, generalized anxiety, and posttraumatic stress disorder. Many more experience non-specific distress, somatic complaints and other medical health conditions. Studies of severe natural disasters (e.g., Armenian earthquake, mudslides in Mexico, Hurricane Andrew in the United States) show that 50% or more of those affected suffer from clinically significant distress or psychopathology.
Studies of large-scale disasters (such as the earthquakes in Asia, floods, volcanoes, and hurricanes in North and Central America) show that the impact on the mental health of survivors is sometimes enormous.
The following factors indicate individuals more at risk following disasters.
The amount of exposure to the disaster is highly related to risk of future mental problems. Both individual and community exposure play a role. Those that directly experience the disaster, followed by those in close contact with victims, will experience more lasting impact than those who only had indirect experiences, such as news of the enormity of the devastation. The current literature shows that injury and life threat are most predictive of likelihood of psychological impairment.
Almost always, women or girls were affected more adversely than were men or boys. The presence of children in the home increases the stressfulness of disaster recovery. Marital stress has been found to increase after disasters.
Research on the reactions of children to natural disasters is limited, yet children generally exhibit more severe distress after disasters than do adults.
Pre-disaster functioning, secondary stressors and psychological resources are important in determining resilience. Factors such as bereavement, injury to self or another family member, life threat, panic or similar emotions during the disaster, horror, separation from family (especially among youth), extensive loss of property, and displacement have been found to predict adverse outcomes.
Compounding these individual risk factors is the fact that disasters occurring in developing countries cause more numerous and severe mental health consequences than do disasters in developed countries. On average, natural disasters in developing countries had more severe effects than did incidents of mass violence in developed countries although usually human-caused disasters are thought of as being more serious.
Social support can be both a risk and resilience factor. As a risk factor, social support can deteriorate over time following disasters due to post-disaster stress and the need of individuals to get on with their own lives. And negative social support (e.g., minimizing problems or needs, unrealistic expectations regarding recovery, playing down a person's pain) is a strong correlate to long-term post-trauma distress. Following mass trauma, previous in group-out group divisions (i.e., racial, religious, ethnic, social, and tribal), even those that may have been socially resolved, may again become apparent, as people try to gain access to much needed resources. And in families conflicts may arise because differing exposure levels among family members sets up different courses of recovery that often are not well understood among family members, or family members may serve as distressing reminders to each other of the circumstances surrounding the disaster.
Human resilience dictates that a large number of individuals will naturally recover from disasters over time and move on, without experiencing debilitating mental health issues. The following factors increase resilience following disasters.
Social support is one of the key ingredients to post-disaster recovery. It has been shown to facilitate well-being and limit psychological distress following mass trauma. Social connectedness increases opportunities for knowledge essential to disaster recovery, as well as providing opportunities for a range of social support activities, including practical problem-solving, emotional understanding and acceptance, sharing of traumatic experiences, normalization of reactions and experiences, and mutual instruction about coping.
Consistent support has been found for the importance of coping self-efficacy in predicting psychological outcomes from a variety of disasters. When individuals feel that they can cope, no matter what happens to them, they tend to do better following a disaster. It is not so much general self-efficacy, but the specific sense that one can cope with trauma-related events that has been found to be beneficial to recovery from disasters.
Those who are likely to have more favorable outcomes after experiencing disasters or mass trauma are those who maintain one or more of the following characteristics:
The literature on the risk and resilience factors associated with disasters on behavioral health functioning suggests the following (Galea et al., 2003):
Additionally, the breadth of the outcomes observed indicates that programs should not focus too narrowly on any one aspect of behavioral health. Interventions aimed at those suffering from lasting negative impacts should seek to address the multitude of possible effects of disasters, foster the protective mediating factors, and reduce vulnerability factors. For instance, based on her review of disaster behavioral health effects, Norris, Friedman, and Watson (2002) recommend the following to disaster behavioral health programs: