The left side of the face numbness and face pain to give people a different sensory experience, in addition to the causes of the two are also somewhat different. The left side of the face is numb, that is, the patient’s left side of the face to lose consciousness or local muscle movement disorders, slow response to external stimuli. Facial sensation is usually innervated by the trigeminal nerve, generally tumor compression, inflammation, poisoning, ischemia, etc. can damage the local nerve, resulting in patients with facial numbness. If the patient suddenly develops numbness in the face, cerebrovascular disease is highly suspected. The left side of the face pain, on the other hand, may be accompanied by parenchymal or underlying tissue damage and is often an unpleasant sensation and emotional feeling. Facial pain etiology is also more varied, with most patients caused by diseases such as trigeminal neuralgia, in addition to facial skin infections and acute sinusitis. When the left side of the face numbness and facial pain, the patient should promptly seek medical attention to clarify the cause and early treatment.