Terrorism can have significant mental health impacts on both direct victims and the general population. In the immediate aftermath of attacks, stress symptoms are very common but usually decline within a few weeks or months for most people. Direct victims are more likely to develop longer-term conditions like PTSD, depression, or anxiety disorders, with rates around 30-40% within two years. Children and those with prior trauma exposure are also at higher risk. While effects tend to be temporary for most, terrorism can still terrorize thousands or millions of people through fear and uncertainty. Mental health experts need to understand terrorism similarly to how doctors understand physical health threats.