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These patterns can persist long after the event that triggered the fear, making an individual hyper-responsive to future fearful situations.PTSD causes biochemical changes in the brain and body, that differ from other psychiatric disorders such as major depression.
PTSD symptoms may result when a traumatic event causes an over-reactive adrenaline response, which creates deep neurological patterns in the brain.
Research has also found that PTSD shares many genetic influences common to other psychiatric disorders.
Panic and generalized anxiety disorders and PTSD share 60% of the same genetic variance.
Resolving these problems can bring about improvement in an individual's mental health status and anxiety levels.
Persons considered at risk include combat military personnel, victims of natural disasters, concentration camp survivors, and victims of violent crime.
However, the majority of people who experience this type of event will not go on to develop PTSD.
An analysis from the WHO World Mental Health Surveys found a 5.2% risk of developing PTSD after learning of the unexpected death of a loved one.Symptoms may include disturbing thoughts, feelings, or dreams related to the events, mental or physical distress to trauma-related cues, attempts to avoid trauma-related cues, alterations in how a person thinks and feels, and an increase in the fight-or-flight response.People who experience interpersonal trauma (for example rape or child abuse) are more likely to develop PTSD, as compared to people who experience non-assault based trauma such as accidents and natural disasters.The maintenance of fear has been shown to include the HPA axis, the locus coeruleus-noradrenergic systems, and the connections between the limbic system and frontal cortex.The HPA axis that coordinates the hormonal response to stress, This over-consolidation increases the likelihood of one's developing PTSD.The amygdala is responsible for threat detection and the conditioned and unconditioned fear responses that are carried out as a response to a threat.