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. When young, the symptoms are usually not obvious, and as age increases, compression symptoms of internal organs may occur, such as chest tightness, panic, and difficulty in breathing, requiring surgical correction. 2. Rib fracture: If the rib is not aligned in time and aberrant healing is formed, it can also lead to significant local augmentation, 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 producing 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 blood supply deficiency, which will affect normal life and work.