Bite muscle pain when you open your mouth may be caused by TMJ. Temporomandibular arthritis symptoms include pain when opening and closing the mouth, joint popping, muscle pain and tenderness, and limited jaw movement. Mild biting muscle pain can be treated with hot towels to improve blood circulation around the biting muscle and reduce pain symptoms. If the pain is very severe, you can take anti-inflammatory drugs such as roxithromycin capsules as prescribed by the doctor. In daily life, the bite muscle pain open mouth pain patients to avoid opening the mouth too large, bite hard objects can lead to the temporomandibular joint negative heavy activities, sleep avoid side lying or prone, to prevent the chin pressure. If the pain is severe, you need to go to the hospital in time to improve the relevant examination to determine the cause of the disease, under the guidance of the doctor for symptomatic treatment.