The presence of a subcutaneous lump at the rib cage is usually due to three reasons: in the first case, a subcutaneous lipoma, which can be felt as a distinct lump under the skin when pressed with the hand and is relatively smooth, with no obvious pain when pressed with the hand. In the second case, the rib fracture and subcutaneous tissue damage after trauma may lead to blood vessel rupture and gradual formation of a subcutaneous hematoma with blood stasis. When pressure is applied with the hand, there will be a significant pain sensation. In the third case, a subcutaneous emphysema may develop, which is mainly due to a fracture of the rib cage, and the fracture is so severe that the fracture end may puncture the lung, causing the gas in the lung to gradually extend to the subcutaneous tissue along the fracture puncture channel to form a subcutaneous emphysema. This condition is often associated with significant chest tightness, panic attacks, and dyspnea, as well as significant pain, especially when breathing heavily and coughing.