Mild numbness on the left side of the face is usually considered facial neuritis, which is a relatively mild form of facial neuritis. Because the bony channels of the facial nerve can become edematous, excessive pressure can lead to ischemia of the local nerve bundles, which can lead to slight numbness on the left side of the face, usually due to the presence of facial cold and viral infections. After this situation, we must pay attention to it, otherwise there is a risk of left-sided facial paralysis also called facial nerve palsy, to take oral hormonal drugs such as prednisone acetate tablets, 30mg per day, once a day orally, can effectively relieve the inflammatory edema caused by facial neuritis, after the reduction of inflammatory edema, the nerve bundle of the facial nerve is no longer stimulated by compression, the symptoms of numbness can be significantly reduced, and After the inflammatory edema is reduced, the nerve bundle of the facial nerve will no longer be stimulated by the compression, and the numbness will be significantly reduced, and oral methylcobalamin tablets should be taken to nourish the facial nerve, and oral dibazol tablets should be taken to improve the local microcirculation.