Below the clavicle above the chest position generally includes the tip of the lungs, ribs, rib cartilage, intercostal muscles and other structures, there are many reasons for pain in this position, the common ones are reflux esophagitis, pleurisy, pneumonia, costal cartilage inflammation, mediastinal tumors, cardiac disease, trauma and so on. 1. Reflux esophagitis: the reflux of gastric contents into the esophagus stimulates the esophageal mucosa, which may cause pain below the clavicle and above the chest. 2. Pleurisy, pneumonia: external pathogenic bacteria, invasion of the chest wall, resulting in pleurisy or infection of the lungs bronchial caused by pneumonia bronchitis, etc., may also lead to pain below the clavicle above the chest position. 3. Costochondritis: it refers to the inflammatory reaction of the cartilage in the connecting area of ribs and sternum, which may also lead to the pain in the position of the upper chest below the clavicle. 4. Mediastinal tumors: mediastinal tumors compressing the adjacent nerves may also cause pain in the upper chest below the clavicle. 5. Heart disease: coronary heart disease, myocardial infarction, pericarditis and so on, may also have the symptom of pain in the supraclavicular position. 6. Trauma: when the chest suffered external force extrusion or smashing may also appear in this position pain symptoms. In short, when the pain below the clavicle above the chest continues to be unrelieved, it is necessary to go to the hospital in time for examination, to clarify the cause of the disease and active treatment, so as not to delay the condition.