There are more reasons for left face pain, if there is no history of trauma, it may be caused by facial nerve disease, oral diseases, etc. There are mainly the following cases: 1, trauma: If the left face pain is caused by collision trauma, it is usually a side of the facial muscle damage, resulting in patients with unilateral face pain with swelling, it is recommended to improve the local X-ray or CT examination to clarify whether there are other injuries; 2, oral diseases: such as acute pulpitis on the left side , which can cause pain on the same side of the face, patients need to promptly consult the stomatology department for root canal treatment. In addition, maxillofacial cellulitis can lead to facial pain with swelling, which requires antibiotics to control infection and incision and drainage if necessary; 3, trigeminal neuralgia: patients can have severe electric shock-like pain on one side of the face, which is preferred to medication and can be minimally invasive if it cannot be relieved; 4, herpes zoster: the left side of the face pain may also be caused by herpes zoster, which can be accompanied by skin blisters and is mainly treated with antiviral, nerve nutrition and pain relief and other treatments. Patients with left side face pain are still recommended to go to the neurology department of the hospital and check brain CT and electromyography if necessary. After clarifying the cause of the face pain, the doctor can take symptomatic medication and treatment to remove the cause.