The main location of the pain is in the bilateral quarter ribs, below the rib cage and in the upper abdomen, and sometimes also in the lower abdomen. The main cause of bruxism is the pain caused by the lack of effective warm-up before strenuous activities, mainly after respiratory muscle spasm. Because when the body is active, the skeletal muscles will be the first to mobilize, will consume a lot of blood and oxygen, will lead to respiratory muscle transient ischemia, hypoxia, respiratory muscle spasm, mainly in the diaphragm and intercostal respiratory muscles above, so it will lead to pain and discomfort in the lumbar muscle ribs. When the pain is obvious, you should rest immediately and try to use abdominal breathing, while massaging the painful location with your hands, you can also gently pat the painful location to relieve the respiratory muscle spasm.