Panic is a common clinical condition, specifically a subjective feeling, a discomfort of conscious heartbeat.
Clinical panic and palpitations are usually caused by an increase in heart rate or abnormal heart rhythm. The most common clinical causes are arrhythmia (atrial fibrillation, premature beats, tachycardia or bradycardia), coronary artery disease, myocarditis, heart failure, etc. Anemia, hyperthyroidism and hypoglycemia can also cause heartburn. Normal people will also have panic attacks when they drink strong tea and coffee, exercise vigorously, and are highly nervous or highly excited.