The document discusses panic disorder, which is characterized by unexpected panic attacks that are unrelated to circumstances. Panic disorder has a lifetime prevalence of 1.5-2% and is more common in females. Causes may include genetic factors, alterations in GABA, repression failure, or painful stimuli. Symptoms include shortness of breath, rapid heartbeat, chest pain, sweating, dizziness, nausea, numbness, trembling, and fear of dying. Treatment includes benzodiazepines, antidepressants, beta blockers, relaxation techniques, breathing exercises, and cognitive behavioral therapy to change negative thoughts.