Being too thin increases the chances of pneumothorax, but does not necessarily cause it.
When too thin, the muscles of the chest wall are relatively weak and therefore less able to fight against sudden changes in pressure in the lungs. Especially when sneezing and coughing violently, the pressure in the lungs rises suddenly and the weak subcutaneous fat and muscles of the chest wall are not strong enough to counteract the increase in pressure in the lungs, thus leading to damage to the pleura of the dirty layer, thus causing pneumothorax.
In addition, thin and tall people are more prone to pneumothorax due to the fact that a more rapid increase in height can thin the lung apices, making them prone to the formation of pulmonary hernias. Pneumothorax can be caused when conditions such as strenuous exercise rupture the lung blisters.
However, this does not mean that being too thin will necessarily lead to pneumothorax, and it is recommended that you consult a medical professional and receive standardized diagnosis and treatment when necessary.