Left jaw pain can be considered to be related to oral diseases, temporomandibular joint disorders, jaw lymphadenitis and other causes. 1. Oral diseases: for example, huge ulcers in the mouth or suppurative infections in the teeth can lead to pain symptoms in the left jaw. At this time, you can take oral metronidazole tablets, watermelon cream tablets under the guidance of the doctor to relieve pain. At the same time, you can gargle with salt water to maintain healthy oral hygiene. 2. Temporomandibular joint disorder: When the left temporomandibular joint disorder occurs, it can lead to temporomandibular joint pain, abnormal mouth opening movement, popping when opening the mouth and other symptoms. It can be manifested as left jaw pain. At this time, you should avoid opening your mouth and chewing hard food to avoid aggravation of symptoms. 3. Mandibular lymphadenitis: When acute lymphadenitis occurs in the jaw, it can lead to lymph node enlargement and pain symptoms, making the left side of the jaw painful. When left jaw pain, it is recommended to pay attention to oral hygiene to avoid infection. If the symptoms persist, it is recommended to go to the hospital to clarify the cause of the disease, so as to facilitate the treatment of the cause.