Respiratory Training in the Treatment of Transdiagnostic Pathological Anxiety

Who May Qualify: 1. Clinically elevated anxiety as indicated by an eight or higher on the Overall Anxiety Severity and Impairment Scale (OASIS). 2. Meets DSM-5 criteria for one or more of the following anxiety or trauma-related disorders as their "primary" mental disorder: - Generalized Anxiety Disorder - Panic Disorder - Health Anxiety - Agoraphobia - Social Anxiety Disorder - Posttraumatic Stress Disorder - Acute Stress Disorder - Adjustment Disorder with primary anxious mood - Anxiety disorder not otherwise specified 3. No current use of psychotropic medications or stable on current medications for at least 6 weeks 4. Age 18+. 5. Able to arrange transportation to our laboratory for study appointments. 6. Fluent in English. Who Should NOT Join This Trial: 1. No history of medical conditions that would contraindicate participation in fear-provocation or respiratory challenges, including: - Cardiovascular or respiratory disorders - High blood pressure - Epilepsy - Strokes - Seizures - History of fainting - Pregnant or lactating 2. Not currently receiving other psychological treatment for anxiety. 3. No history of a suicide attempt within the past 6 months. 4. No history of psychosis within the past 6 months. 5. No history of moderate to severe alcohol or substance use disorder (with the exception of nicotine) within the past 3 months. 6. Does not endorse COVID-19 symptoms during the screening phase. Always talk to your doctor about whether this trial is right for you.