Pneumothorax is caused by a rupture of the pleura, allowing air to enter the pleural cavity. The severity of symptoms after suffering from pneumothorax can vary, with common symptoms including coughing, chest pain, chest tightness, and difficulty breathing. The severity of symptoms largely depends on the amount of air in the pleural space. If the amount of air is small, symptoms might not be noticeable. However, with a larger amount of air, difficulty breathing can be quite severe. In cases of tension pneumothorax, the symptoms can be extremely severe and may even lead to respiratory and circulatory failure in a short period. Patients often experience significant chest tightness, restlessness, dry skin, heavy sweating, and may even lose consciousness. Immediate treatment is necessary, as there could be a risk to life.