New research finds that an imbalance between two neurochemical systems in the brain is linked to posttraumatic stress disorder with the greater the imbalance, the more serious the symptoms.

Researchers from Uppsala University and the medical university Karolinska Institutet in Stockholm, Sweden, found that people with posttraumatic stress disorder have an imbalance between two neurochemical systems in the brain, serotonin, and substance P.

Experiencing a traumatic event is not uncommon be it a robbery, warfare, a serious car accident, or a sexual assault. Approximately 10% of people subjected to trauma suffer long-lasting symptoms in the form of disturbing flashbacks, insomnia, hyperarousal, and anxiety.

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