Psychologically traumatic experiences often involve physical trauma that threatens one's survival and sense of security. Typical causes and dangers of psychological trauma include harassment, embarassment, sexual abuse, employment discrimination, police brutality, bullying, domestic violence, indoctrination, being the victim of an alcoholic parent, the threat of either, or the witnessing of either, particularly in childhood, life-threatening medical conditions, medication-induced trauma. Catastrophic natural disasters such as earthquakes and volcanic eruptions, war or other mass violencecan also cause psychological trauma. Long-term exposure to situations such as extreme poverty or milder forms of abuse, such as verbal abuse, exist independently of physical trauma but still generate psychological trauma.
However, the definition of trauma differs among individuals by their subjective experiences, not the objective facts. People will react to similar events differently. In other words, not all people who experience a potentially traumatic event will actually become psychologically traumatized.This discrepancy in risk rate can be attributed to protective factors some individuals may have that enable them to cope with trauma. Some examples are mild exposure to stress early in life, resilience characteristics, and active seeking of help.
Some theories suggest childhood trauma can increase one's risk for psychological disorders including PTSD, depression, and substance abuse. Childhood adversity is associated with heightened neuroticism scores during adulthood. Childhood abuse tends to have the most complications with long-term effects out of all forms of trauma because it occurs during the most sensitive and critical stages of psychological development. It could also lead to violent behavior, possibly as extreme as serial murder. For example, Hickey's Trauma-Control Model suggests that "childhood trauma for serial murderers may serve as a triggering mechanism resulting in an individual's inability to cope with the stress of certain events."