There are many hazards of pneumothorax, such as impeded breathing, decreased autoimmunity and lung atrophy. 1. Obstructed breathing: long-term pneumothorax can lead to imbalance of pressure in the lungs, thus affecting the normal respiratory function, which may cause purple lips, shortness of breath, chest pain, shortness of breath and other phenomena, resulting in respiratory failure, and in serious cases, it can be life-threatening. 2. Decrease in autoimmunity: Long-term pneumothorax can also lead to a decrease in autoimmunity, which increases the risk of other diseases and poses a certain danger to the body. 3. Lung atrophy: If pneumothorax is not treated in time, it may lead to lung atrophy. There are many other harmful effects of pneumothorax, and you should go to the hospital in time after the appearance of pneumothorax, and take standardized treatment under the guidance of the doctor.