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Subcutaneous emphysema can be caused by medical procedures and medical conditions that cause the pressure in the alveoli of the lung to be higher than that in the tissues outside of them. Its most common causes are pneumothorax and a chest tube that has become occluded by a blood clot or fibrinous material.
The most common cause of emphysema is cigarette smoking, although rare forms of emphysema may occur in non-smokers. Emphysema may be present with other lung diseases, such as chronic bronchitis and asthma.Like emphysema, these diseases are made worse by cigarette smoking.Emphysema and chronic bronchitis are often grouped together and commonly called chronic obstructive pulmonary disease (COPD). Exposure to air pollution and noxious particles or gases could also cause or worsen these conditions.he most common cause of emphysema is cigarette smoking, although rare forms of emphysema may occur in non-smokers. Emphysema may be present with other lung diseases, such as chronic bronchitis and asthma.