In general, trauma can be defined as a psychological, emotional response to an event or an experience that is deeply distressing or disturbing. When loosely applied, this trauma definition can refer to something upsetting, such as being involved in an accident, having an illness or injury, losing a loved one, or going through a divorce. However, it can also encompass the far extreme and include experiences that are severely damaging, such as rape or torture.
Because events are viewed subjectively, this broad trauma definition is more of a guideline. Everyone processes a traumatic event differently because we all face them through the lens of prior experiences in our lives. For example: one person might be upset and fearful after going through a hurricane, but someone else might have lost family and barely escaped from a flooded home during Hurricane Katrina. In this case, a minor Category One hurricane may bring up traumatic flashbacks of their terrifying experience.
Because trauma reactions fall across a wide spectrum, psychologists have developed categories as a way to differentiate between types of trauma. Among them are complex trauma, post-traumatic stress disorder (PTSD), and developmental trauma disorder.