The sternum is high on one side and low on the other, and the following causes are common: 1. congenital developmental malformation: leads to asymmetry between the left and right side of the thorax, appearing high on one side and low on the other, the symptoms are usually not obvious when young, and as age increases, compression symptoms of internal organs may occur, such as chest tightness, panic, and breathing difficulties, requiring surgical correction. 2. rib fracture: if not aligned in time, forming a deformed healing, it can also lead to significant local elevation, resulting in bilateral asymmetry. Therefore, patients who have a high sternum on one side and a low sternum on the other side should be diagnosed and treated in a timely manner to avoid generating severe visceral compression and causing respiratory difficulties, or else the patient will develop serious heart, lung, and brain diseases, such as pulmonary heart disease and cerebral insufficiency of blood supply, which will affect normal life and work.