The pain of the lower breast bone may be caused by the following reasons: 1, physiological factors: recent strenuous exercise, exertion, trauma, etc., can cause pain in the soft tissue under the breast, such pain can be relieved after rest. 2, chondromalacia: chondromalacia of the rib prevalent in young women, mostly aseptic inflammation, local redness and swelling and increased skin temperature and other clinical manifestations. The actual pain can be relieved by oral anti-inflammatory and analgesic drugs, as well as hot towels and other treatments. 3, intercostal neuralgia: If the lower ribs of the breast have been injured or impacted by external forces, it may cause intercostal nerve pain, the nature of the pain is mostly wandering pinprick-like pain, when oral ibuprofen extended-release tablets can be anti-inflammatory and analgesic.