The symptoms of numbness in the left upper lip may be facial neuritis or transient cerebral ischemia, or it may be a manifestation of cerebral infarction, and it is recommended to consult a doctor for examination and treatment. 1. If it is simply numbness in the left upper lip, the condition is generally not too serious, but it is necessary to actively find the cause for symptomatic treatment. If transient cerebral ischemic attack is considered, the numbness of the upper lip may last for a few seconds or minutes to completely relieve, during which aspirin and anti-platelet aggregation are used to prevent the formation of blood clots. 2. If the continuous numbness of the upper left lip is not relieved, a mild lacunar cerebral infarction should be considered, and drugs such as edaravone and thromboxane can be used to improve cerebral blood circulation and improve symptoms. 3. 3, if the upper lip numbness is considered facial neuritis to give drugs such as methylcobalamin to nourish the facial nerve.