The main common causes of pain in the right facial bite muscle are temporomandibular joint disorder syndrome and infection. TMJ disorder, also known as temporomandibular joint disorder, can cause painful discomfort in the muscles, resulting in pain in the bite area. It is necessary to find the cause of TMJ disorder syndrome, and the pain will disappear after removing the cause and treating the symptoms. TMJ disorder syndrome is usually caused by bad eating habits, such as eating a lot of hard food or chewing unilaterally for a long time, which causes pain and soreness in the right bite muscle. In addition, the function of the bite muscle may also be disturbed by excessive mental stress and mental tension, causing pain in the bite muscle. If the patient has oral infection, such as pericoronitis of wisdom teeth or periapical infection in the posterior region, it can cause interstitial infection in the occlusal region and also cause inflammation and swelling of lymph nodes, which can cause pain in the occlusal region. The odontogenic infection needs to be treated in the dentistry department of a regular hospital, and the pain in the bite muscle can be relieved after the inflammation is controlled. When patients have pain in the bite muscle, they can be relieved with hot compresses or physical therapy in the painful area, or they can take oral painkillers for proper pain relief. In case of severe pain, patients should go to the oral surgery department of the hospital as soon as possible.