From https://blackbearrehab.com/mental-health/ptsd/signs-and-symptoms-of-ptsd/
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In the most recent publication of the DSM, the DSM-V, PTSD symptoms are grouped into five different clusters. One or more symptoms are required from each of these clusters in order for a patient to receive a full diagnosis.
Those clusters include:
1. Stressor – (one required) The person was exposed to injury or severe illness that was life-threatening, which includes actual or threatened injury or violence. This may include at least one of the following:
Direct exposure to the trauma
Witnessing a trauma
Exposure to trauma by being a first responder, such as police, firefighter, medic, or crisis counselor
Learning that someone close to you experienced the trauma
2. Intrusion Symptoms (one required) – The person who was exposed to a trauma then re-experiences the trauma in one or more ways, including:
Flashbacks
Nightmares
Distressing and intense memories
Distress or physical reactions after being exposed to reminders, known as “triggers”
3. Unpleasant Changes to Mood or Thoughts (two required) –
Blaming self or others for the trauma
Decreased interest in things that were once enjoyable
Negative feelings about self and the world
Inability to remember the trauma clearly
Difficulty feeling positive
Feelings of isolation
Negative affect, and difficulty feeling positive
4. Avoidance (one required) – This occurs when a person tries to avoid all reminders of the trauma, including:
Avoiding external reminders of what happened
Avoiding trauma-related thoughts or emotions, sometimes through the use of drugs or alcohol
5. Changes in Reactivity (two required) – This occurs when a person becomes more easily startled and reacts to frightful experiences more fully, including symptoms of:
Aggression or irritability
Hypervigilance and hyper-awareness
Difficulty concentrating
Difficulty sleeping
Heightened startle response
Engaging in destructive or risky behavior
Difficulty sleeping or staying asleep
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PTSD - A Way Out.com 