The causes of sudden dizziness and numbness of the patient’s mouth may be the following: 1. If the patient has a lateralized numbness of the mouth with dizziness, it is not excluded that it is caused by cerebrovascular disease. If it is episodic, transient ischemic attack is considered. If the patient’s dizziness is lateralized and the symptoms of numbness in the mouth persist, it may be caused by a minor cerebral infarction or a minor cerebral hemorrhage. The patient needs to consult a hospital to improve the head MRI, functional brain imaging or head CT examination, and to carry out symptomatic treatment for the cause. 2. If the patient’s dizziness and mouth numbness appear after emotional excitement, loud crying, or hyperventilation, it is considered to be related to the patient’s emotions and is caused by respiratory alkalosis.