Final answer:
PTSD is an anxiety disorder triggered by traumatic events, leading to extended periods of extreme symptoms. Symptoms lasting less than a month classify as Acute Stress Disorder, while those persisting longer diagnose as PTSD.
Step-by-step explanation:
One category of anxiety-related disorders is Post-Traumatic Stress Disorder (PTSD). These disorders are typically triggered by previous experience with traumatic events. If someone experiences extreme symptoms from the recollection of a traumatic event for less than a month, it is referred to as Acute Stress Disorder (ASD). Whereas, if these symptoms last for more than a month, it can be referred to as PTSD. PTSD can develop after exposure to a traumatic event, such as military combat, natural disasters, or personal assaults, and is characterized by intrusive thoughts, hyperarousal, and avoidance related to the trauma.