This chapter presents an introduction to the physical health problems following disasters as well as disaster studies. The majority of studies after traumatic events such as disasters have focused on psychological problems, such as depression, anxiety, and posttraumatic stress disorder (PTSD), and they have shown a positive relation between exposure to traumatic stress and psychopathology. Several studies have examined the prevalence of specific symptoms among survivors of disasters. The mean number of physical symptoms was compared between survivors of a disaster and a control group. Although risk factors for psychological problems after exposure to traumatic stress have been investigated in many studies after disasters, only a few risk factors for physical symptoms have been examined after several disasters. Risk factors for physical symptoms after disasters can be divided into predisaster factors, disaster-related factors and postdisaster factors.