The numbness of half of the face is most likely caused by facial neuritis, resulting in the following causes of facial neuritis: 1, due to viral infection caused by a cold, wind, cold, etc. will appear viral infection, once the viral infection after damage to the inverted facial nerve will appear facial neuritis, which is clinically known as facial paralysis, patients will appear half of the face numbness, mouth and eyes crooked, indifferent expression and other symptoms, this time should be through the The first thing you need to do is to get a good idea of what you’re looking for. 2. Facial neuritis can also be caused by a cerebrovascular accident, which often damages the facial nerve after a brain infarction, brain hemorrhage, etc. Once the facial nerve is damaged, the sensory nerves that innervate the head and face will be abnormal, and half of the face will be numb.