Whether a rib fracture is serious depends mainly on the extent of the fracture and the damage to the surrounding tissues. Generally, a single rib fracture or a non-displaced rib fracture is not serious and requires conservative treatment. However, if there are multiple rib fractures occurring at once, breaking several ribs, including possibly the sixth rib, the consequences can be very serious because it may result in a flail chest. Secondly, a rib fracture can potentially damage surrounding structures such as the pleura, lung tissue, and blood vessels, resulting in conditions such as pneumothorax, pleural effusion, and even active hemothorax, which must be promptly treated to avoid life-threatening situations. Thirdly, if a rib fracture heals in a deformed manner and is not treated, it can compress blood vessels and nerves, causing a persistent type of intercostal neuralgia even after healing. Apart from the local deformity, this situation often stimulates the intercostal nerves and may require surgical intervention. Therefore, the severity of a rib fracture depends mainly on the degree of the fracture and its aftermath, and typically requires assessment by a professional doctor.