The typical clinical symptoms of novel coronavirus pneumonia are cough, fever, and progressive dyspnea. Dyspnea is often caused by respiratory failure after the virus has invaded the lungs and caused pulmonary gas exchange dysfunction at a later stage of disease progression, usually manifesting as chest tightness and shortness of breath. As the disease progresses, the lung lesions may change from one to two or from two to many, and the affected area will gradually increase, and the gas exchange function will be significantly reduced, which is manifested by gradually increasing dyspnea. Therefore, the respiratory distress of novel coronavirus pneumonia is progressively aggravated. Some people may feel that they have dyspnea during the epidemic due to nervousness, but it is actually different from the dyspnea characteristic of novel coronavirus. Content source: Dr. Yurai