Millions of volunteers respond after disasters, with a 24% to 46% risk of developing posttraumatic stress disorder (PTSD). It is unclear which symptom trajectories develop and how they differ between core (volunteering before the disaster) and noncore volunteers (joining after the disaster) and which factors predict trajectories. Symptoms of PTSD were assessed at 6-, 12-, and 18-months postearthquake in 449 volunteers in Indonesia.

Social and political tensions keep on fueling armed conflicts around the world. Although each conflict is the result of an individual context-specific mixture of interconnected factors, ethnicity appears to play a prominent and almost ubiquitous role in many of them. This overall state of affairs is likely to be exacerbated by anthropogenic climate change and in particular climate-related natural disasters. Ethnic divides might serve as predetermined conflict lines in case of rapidly emerging societal tensions arising from disruptive events like natural disasters.

Paradoxical findings show post-traumatic stress disorder may be less common in places more vulnerable to tragic events
People living in affluent countries are more likely to suffer from post-traumatic stress disorder than those in poorer nations, according to the results of a study that have surprised researchers.

The many humanitarian crises of recent years, the persistence of conditions of war and the systematic violation of human rights in many countries have forced millions of people to flee, undertaking journeys that are often very dangerous. According to data from the UN Refugee Agency (UNHCR), there are now 65,3 million of people who left their home in the world. Recent evidence shows an increased risk of mental disorders among forced migrants and asylum seekers.