Which disorder causes people to have flashbacks of a stressful event

This disorder is called PTSD, or Post Traumatic Stress Disorder.

PTSD is a condition that may last a few months or even years, with triggers that may bring forth memories of the trauma accompliced with powerful physical and emotional tics.  Symptoms of PTSD can include nightmares or stressful, unwanted and uncontrollable memories of the scene. Certain treatment options can include different types of trauma-focused psychotherapy and special medications to manage PTSD symptoms. PTSD is usually associated with war veterans and murder witnesses.

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-PepeTreefrogThe2nd

need more informotion

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health