Sternal pain may be gastrointestinal diseases, lung diseases, chest wall diseases, cardiovascular diseases, and hematologic diseases. 1. Gastrointestinal diseases: such as reflux esophagitis can cause retrosternal pain, and other accompanying symptoms include acid reflux, heartburn, belching and so on. 2. Lung diseases: such as bronchitis, tuberculosis, etc., the inflammation invades the pleura, manifested as chest pain, other accompanying symptoms include cough, fever, dyspnea, etc.. 3. Chest wall diseases: such as rib fracture, manifested as localized pain, aggravated by coughing and position change, localized bruising or skin lesions. 4. Cardiovascular diseases: such as acute heart attack, angina pectoris, etc., may also appear sternal pain, mostly compression pain, often accompanied by palpitations, chest tightness and other symptoms. 5. Blood system diseases: such as leukemia, cancer cells invade into the sternum, which may present pressure pain in the sternum, accompanied by bleeding tendency. Sternal pain can also be seen in other diseases, and it is recommended to seek medical treatment in time to avoid delaying the condition.