Step 1: Understanding the Question:
The question asks us to identify the clinical disorder characterized by symptoms of anxiety, intrusive memories, and hyperarousal lasting more than one month following a major traumatic stressor.
Step 2: Detailed Explanation:
• Post-Traumatic Stress Disorder (PTSD) is a mental health condition triggered by experiencing or witnessing a terrifying, life-threatening event.
• Symptoms of PTSD include intrusive memories (recurring nightmares, flashbacks), avoidance of trauma reminders, negative alterations in mood, and marked hyperarousal (sleep disturbances, concentration problems).
• Crucially, the diagnostic criteria in both the DSM-5 and ICD-11 require these symptoms to persist for more than $1$ month following the trauma.
• If the symptoms occur within the first month immediately following the trauma, the diagnosis is Acute Stress Disorder (ASD).
• Pre-traumatic stress disorder is not an established clinical diagnosis in psychiatric classification.
• General stress disorder is not a formal diagnostic category in standard manuals like DSM-5.
Step 3: Final Answer:
When symptoms like nightmares, hyperarousal, and concentration deficits persist for more than $1$ month after a major stressor, the diagnosis is Post traumatic stress disorder.