The causes of bite muscle pain may be: 1, due to periapical inflammation of the mandibular posterior teeth, periodontal inflammation or pericoronitis of the wisdom teeth, inflammation can spread to the bite muscle causing infection of the bite muscle gap, causing redness, swelling and pressure pain in the bite muscle area. 2, prefer to eat hard and tough substances, such as beef jerky and nuts and so on, long-term chewing of such food can cause fatigue of the bite muscle leading to pain in the bite muscle area. 3, suffering from temporomandibular joint disorder The main symptoms are pain in the temporomandibular joint area, that is, in the preauricular area, pain in the bite muscle, restricted mouth opening and a series of other phenomena. 4, patients with night grinding teeth in sleep due to the temporomandibular joint and bite muscle function movement enhanced, so that the bite muscle long-term contraction, tension led to the appearance of pain in the wake of sleep pain in the bite muscle.