If sudden panic and dyspnea occur, there are usually several factors: 1. Diseases of cardiac origin, such as coronary atherosclerotic heart disease, unstable angina pectoris, myocarditis, pericarditis, infective endocarditis, cardiac valvulopathy, or dilated cardiomyopathy, can cause sudden panic and dyspnea.2. Diseases of the respiratory system, such as chronic bronchitis, bronchial dilatation, chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, and pulmonary hypertension, can also cause palpitation, panic, and dyspnea.3. dilatation, chronic obstructive emphysema, chronic pulmonary heart disease, pulmonary hypertension, will also appear palpitations, panic, dyspnea feeling.3, Infectious systemic diseases, such as large lung infections or even severe pneumothorax, will also have panic, palpitations, dyspnea symptoms.