Impermeable air is related to obstructive lung disease, pneumothorax, heart failure and other diseases. I. Patients with low body immunity are prone to the phenomenon of cold after the weather suddenly becomes cool, which will lead to nasal congestion and inability to breathe. 2, pathological factors: 1, there is chronic obstructive pulmonary disease, this disease is mainly due to the inflammation of the airway parts leading to local physiological changes, local inflammation will affect the person’s breathing, resulting in patients appear cough, shortness of breath, phlegm, etc.; 2, lung infection or lung cancer and other diseases can lead to fluid accumulation in the thoracic area, thus causing patients to appear sudden shortness of breath, can go to the hospital for examination, mainly considered to be caused by pneumothorax;; 3.Some cardiogenic diseases, such as heart failure, can also lead to shortness of breath. 4.Also consider the underlying diseases, commonly hypertension, coronary heart disease or diabetes, smoking, etc., which may lead to the patient’s breathlessness.