Dyspnea, shortness of breath, and dyspnea are considered pathologic factors such as acute myocardial infarction, acute pericarditis, and myocarditis, while physiologic or psychologic factors cannot be excluded. 1. Acute myocardial infarction: patients with acute myocardial infarction mainly show some hemodynamic changes of diastolic and systolic dysfunction of the left ventricle, with a decrease in ejection fraction and cardiac output and an increase in heart rate. Cardiogenic shock or acute pulmonary edema may occur in severe cases. Patients mainly manifest pain, fever, tachycardia and other systemic symptoms as well as ventricular arrhythmia, dyspnea and so on. 2. Acute pericarditis: the most common cause is induced by viral infection. Patients mainly present with retrosternal pain associated with respiratory movements. With the development of the disease, the symptoms can change from chest pain to chest tightness and dyspnea. 3. Myocarditis: a variety of viruses may cause myocarditis. Clinical manifestations mainly depend on the extent and location of the lesions. Most patients have fever, muscle aches and pains, as well as gastrointestinal symptoms such as nausea and vomiting, followed by palpitations, chest pain, dyspnea, and even fainting and sudden death. 4. Physiological or psychological factors, such as stress, bad rest, bad mood, anxiety, depression, etc. Some serious ones may cause somatic symptoms, such as panic and shortness of breath, chest tightness and difficulty in breathing. It is recommended that patients go to the hospital in a timely manner, under the guidance of a professional doctor to improve the relevant examinations and receive standardized treatment.