Cold is mainly caused by viral infection or bacterial infection, which can cause inflammatory reaction in the respiratory tract, thus affecting normal respiratory function and gas exchange, resulting in symptoms of dyspnea and shortness of breath. 1. viral infection: mainly influenza virus, adenovirus and other infections, which cause inflammatory reaction in the respiratory tract, resulting in increased nasal discharge and sputum, thus blocking the airway and affecting normal ventilation, resulting in dyspnea and shortness of breath. This blocks the airway and affects normal ventilation, resulting in breathlessness and shortness of breath. Although the infection is self-limiting, if the symptoms are severe or persistent, timely antiviral treatment is required if necessary, mainly oseltamivir, ribavirin, acyclovir, etc. At the same time, pay attention to keep the drainage of nasal mucus and sputum smooth, can apply nebulized inhalation and other methods to dilute the sputum and promote the discharge, which is helpful to reduce the symptoms of breathlessness and shortness of breath; 2. Bacterial infection: If there is bacterial infection, you can follow the medical advice to use antibiotics for treatment, mainly penicillin, cephalosporins, such as amoxicillin, cefixime, cefradine, cefoxitin, cefoperazone and other drugs. When the cold causes myocarditis and abnormal manifestations such as arrhythmia, there can be panic, chest tightness, shortness of breath, and even dyspnea. It is necessary to maintain cardiac function while antiviral treatment, and antiventricular arrhythmia drugs such as lidocaine can be used for treatment as prescribed by the doctor. Therefore, when symptoms of dyspnea and shortness of breath occur after a cold, it is important to seek medical attention, ensure rest and close observation, and receive treatment as prescribed by the doctor to avoid serious complications.