The pain behind the sternum after exerting the upper limb may be due to the damage of the sternum, and the common causes are sternoclavicular arthritis, costochondritis, cracked ribs and so on. 1.sternoclavicular arthritis: generally can take physical therapy such as acupuncture, massage, but also oral non-steroidal anti-inflammatory drugs aspirin, ibuprofen and so on to anti-inflammatory pain. If necessary, brake and suspend the upper limbs to avoid the pain caused by the activities of the upper limbs, so that it can recover faster. 2. Costal chondritis: for non-specific costal chondritis generally do not need treatment, or take pain medication to relieve pain. For specific costochondritis, it is necessary to identify the infecting bacteria, antibiotic treatment, the use of non-steroidal drugs such as ibuprofen, naproxen and other anti-inflammatory analgesic. 3. Fractured ribs: Fractured ribs can be caused by bumping or falling. Generally, fractured ribs are stable fractures and can be treated conservatively with bed rest, avoiding large-scale upper limb activities, and oral non-steroidal drugs such as aspirin and ibuprofen to relieve pain. Upper extremity pain behind the sternum may also have other causes, it is recommended that patients go to the hospital in a timely manner to identify the cause of the disease and give targeted treatment.