Swollen and painful bite muscles may be caused by occlusal trauma factors or pathological factors, such as suffering from dental diseases and mumps. Patients are advised to make self-adjustment first. If the pain persists and cannot be relieved, it is recommended to consult a doctor for appropriate treatment. I. Occlusal trauma factors: usually due to the influence of diet, such as excessive chewing gum or betel nut, will lead to excessive use of the bite muscle, the phenomenon of transient swelling, pain, generally through the adjustment of diet, pay attention to rest can be improved, without special treatment. Pathological factors: 1, dental disease: mainly wisdom teeth pericoronitis or molar periapical inflammation, easily lead to gum swelling, if more serious will lead to swelling and pain in the bite muscle area. Wisdom tooth pericoronitis can be treated with oral cefixime or amoxicillin and other drugs. If the inflammation recurs, you need to visit a dentist and have the tooth extracted if necessary. If a molar tooth suffers from periapical periodontitis, it needs to be improved by means of root canal treatment; 2. Mumps: mostly a viral infection disease that causes swelling and pain in the bite area, and is also accompanied by fever and physical weakness symptoms. Patients can be treated with oral ribavirin, acyclovir and other antiviral drugs, and those with severe pain can be relieved with oral ibuprofen, celecoxib and other drugs.