Cold with sudden dyspnea is considered to induce other diseases, such as common spontaneous pneumothorax, viral pneumonia, laryngeal edema, bronchial asthma and other diseases. 1. Spontaneous pneumothorax: Spontaneous pneumothorax may be induced if there is strenuous exercise, violent coughing, or straining to defecate during a cold. Spontaneous pneumothorax is often characterized by sudden dyspnea, chest tightness, shortness of breath, chest pain and other symptoms. 2. Viral Pneumonia: Cold and flu patients may cause viral pneumonia as their condition worsens. The symptoms of viral pneumonia include dyspnea, cough and sputum. 3. Laryngeal edema: Laryngeal edema can be caused by allergy to cold medicines or exposure to pollen or irritating chemicals during a cold. Laryngeal edema will have sudden difficulty in breathing, hoarseness, increased secretion in the throat and so on. 4. Bronchial asthma: After a cold induces bronchial asthma, due to bronchial spasm, dyspnea, chest tightness, shortness of breath and other symptoms can suddenly appear. Sudden onset of dyspnea may also be due to other reasons, it is recommended to go to the hospital in time to check the specific causes and treatment, so as not to delay the condition.