Simply put, spontaneous pneumothorax is a type of pneumothorax. In the classification of pneumothorax, besides spontaneous pneumothorax, there are also traumatic pneumothorax and iatrogenic pneumothorax. Traumatic pneumothorax is caused by direct or indirect injury to the chest wall, while iatrogenic pneumothorax occurs during medical diagnosis and treatment. Spontaneous pneumothorax often involves underlying lung diseases, such as emphysema, lung bullae, tuberculosis, lung cancer, and pneumoconiosis. It can also occur in healthy individuals without obvious lung abnormalities, typically seen in tall, thin males of young to middle age.