Numbness of lips may be the precursor of stroke, and may also be caused by food factors, nerve dysfunction and other reasons. 1. Stroke: commonly seen in ischemic stroke, due to local ischemia of brain tissue, resulting in damage to brain nerves, causing local brain tissue dysfunction, which may cause numbness of the lips, and may be accompanied by speech disadvantage, difficulty in swallowing and other manifestations. 2. Food factors: for example, a large number of spicy and stimulating food, may cause transient numbness of the lips. This is a normal physiological phenomenon and does not require special intervention. 3. Neurological disorders: usually caused by long-term mental trauma, or long-term mental stress, can lead to neurological disorders, autonomic nervous system dysregulation, may cause numbness of the lips, may also be accompanied by dizziness, panic and other symptoms. As you can see, numbness of the lips is not necessarily a precursor to stroke, if the numbness of the lips frequent symptoms, and lasts for a long time, you should seek medical attention as soon as possible.