Mandibular arthritis is a condition of temporomandibular joint disorder (TMJD) and is caused by a variety of factors. The most common factor is the occlusal factor, which is caused by the presence of bite disorders or excessive missing molar teeth, or the use of poor restorations, resulting in abnormalities in the bite process, which can cause chronic damage to the temporomandibular joint and cause pain. In this case, the bite disorder should be corrected by a dentist to improve the situation. Trauma is also a common cause of mandibular arthritis, such as acute injury from a local impact, sudden opening of the mouth to chew on something hard, or yawning and over-opening of the mouth, can cause acute injury to the TMJ. Another cause that is often overlooked is when there is excessive mental stress, anxiety or depression, etc., which can also lead to local dysfunction of the TMJ and the development of mandibular arthritis. Other causes of TMJ arthritis include rheumatoid arthritis, rheumatoid arthritis, gout, etc. Among these causes, rheumatoid arthritis is more common. It is best to get a detailed examination from a dentist to clarify the cause of TMJ and then do targeted treatment.