PTSD has been known by many names in the past, such as “shell shock” during the years of World War I and “combat fatigue” after World War II. But PTSD does not just happen to combat veterans. PTSD can occur in all people, in people of any ethnicity, nationality or culture, and any age. PTSD affects approximately 3.5 percent of U.S. adults, and an estimated one in 11 people will be diagnosed PTSD in their lifetime. Women are twice as likely as men to have PTSD.

People with PTSD have intense, disturbing thoughts and feelings related to their experience that last long after the traumatic event has ended. They may relive the event through flashbacks or nightmares; they may feel sadness, fear or anger; and they may feel detached or estranged from other people. People with PTSD may avoid situations or people that remind them of the traumatic event, and they may have strong negative reactions to something as ordinary as a loud noise or an accidental touch.

A diagnosis of PTSD requires exposure to an upsetting traumatic event. However, exposure could be indirect rather than first hand. For example, PTSD could occur in an individual learning about the violent death of a close family. It can also occur as a result of repeated exposure to horrible details of trauma such as police officers exposed to details of child abuse cases.

Symptoms and Diagnosis

Symptoms of PTSD fall into four categories. Specific symptoms can vary in severity.

• Intrusive thoughts such as repeated, involuntary memories; distressing dreams; or flashbacks of the traumatic event. Flashbacks may be so vivid that people feel they are re-living the traumatic experience or seeing it before their eyes.
• Avoiding reminders of the traumatic event may include avoiding people, places, activities, objects and situations that bring on distressing memories. People may try to avoid remembering or thinking about the traumatic event. They may resist talking about what happened or how they feel about it.
• Negative thoughts and feelings may include ongoing and distorted beliefs about oneself or others (e.g., “I am bad,” “No one can be trusted”); ongoing fear, horror, anger, guilt or shame; much less interest in activities previously enjoyed; or feeling detached or estranged from others.
• Arousal and reactive symptoms may include being irritable and having angry outbursts; behaving recklessly or in a self-destructive way; being easily startled; or having problems concentrating or sleeping.

Many people who are exposed to a traumatic event experience symptoms like those described above in the days following the event. For a person to be diagnosed with PTSD, however, symptoms last for more than a month and often persist for months and sometimes years. Many individuals develop symptoms within three months of the trauma, but symptoms may appear later. For people with PTSD the symptoms cause significant distress or problems functioning. PTSD often occurs with other related conditions, such as depression, substance use, memory problems and other physical and mental health problems.