Pain on the left side of the face is a common clinical cause, mainly in the following cases: a. Patients have swelling on the left side of the face caused by oral infection due to mouth ulcers and dental abscesses. Patients can take watermelon cream tablets, metronidazole tablets and light salt water gargle orally to control the infection of the mouth, promote the healing of the ulcer wound and reduce the swelling and pain of the left side of the face. For patients with abscessed teeth, tooth extraction is required if necessary to completely solve the swelling and pain of the face. Second, patients who fall during strenuous exercise can cause soft tissue damage to the left side of the face, causing local pain symptoms. At this time, local ice can be applied to reduce tissue exudation, and 24 hours later, hot ointment packs can be applied externally, moxibustion strips can be fumigated, blood circulation and stasis cream can be applied externally, and drugs such as swelling and pain can be taken orally to promote faster relief of the symptoms of pain on the left side of the face.