Temporomandibular joint pain when opening the mouth is mainly due to temporomandibular joint disorder, and the treatment is self-care, non-steroidal anti-inflammatory painkillers, local closure and so on. 1. Self-care: self-limiting jaw movement, recognizing and correcting bad habits such as biting hard objects. 2. Non-steroidal anti-inflammatory and analgesic drugs: mainly act on the inflammatory damage of peripheral tissues. The adverse effects of these drugs are mainly gastrointestinal irritation. 3. Local closure: the treatment of myofascial trigger points is very effective, can be used alone, but also with the muscle stretching exercise training. The above is from Oral and Maxillofacial Surgery. Temporomandibular joint pain when opening the mouth may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.