There are three main reasons to consider when a patient with a cold can’t breathe: 1. The cold itself may lead to the symptom of breathlessness, because the cold can cause acute upper respiratory tract infections, leading to congestion and edema in the nasal cavity, which affects the respiratory airflow, or cause congestion and edema in the throat, which affects the respiratory airflow and leads to breathlessness.2. The cold can be complicated with myocarditis, which leads to damage of the heart muscle, and the contractility of the heart muscle The cold can be complicated by myocarditis, which causes damage to the heart muscle and decreases the contractility of the heart muscle, resulting in ischemia and hypoxia, leading to chest tightness and breathlessness.3. Colds are complicated by pneumonia, especially viral pneumonia, which affects the ventilation and gas exchange function of the lungs, leading to hypoxia, which causes the symptoms of chest tightness and breathlessness. Therefore, patients with colds who have shortness of breath should improve the electrocardiogram, myocardial enzymes and CT examination of the lungs in time to clarify.