Unexplained cough and dyspnea may be caused by asthma, allergy, cardiovascular disease and so on. 1. Asthma: it is a highly reactive disease of the airways, which is the more common cause of cough and dyspnea. Bronchospasm can occur during an acute attack of asthma, leading to narrowing of the airways, causing dyspnea, coughing and other symptoms. 2. Allergy: Due to allergy to airborne dust mites or some objects, it can also cause an inflammatory response in the airways, leading to bronchospasm, and symptoms such as cough and dyspnea. 3. Cardiovascular disease: If the patient has an underlying disease such as heart failure, it may aggravate the heart failure and cause symptoms such as cough and dyspnea when there is an increase in oxygen consumption due to an increase in the amount of activity or an increase in the amount of return blood due to sleeping at night. There are other diseases that can cause cough and dyspnea. If the symptoms are not relieved or worsened, it is recommended to consult a doctor in time for examination and treatment under the doctor’s guidance.