Numbness of the lips belongs to a sensory abnormality, the cause of numbness of the lips in female patients is more complex, and may be related to allergies or increased blood viscosity and other factors, the need to be alert to the emergence of the following diseases: 1, allergies: may be due to contact with food or drugs caused by numbness of the lips, such as female patients exposed to pollen, eating seafood or animal hair, allergies caused by numbness performance; 2, hyperlipidemia, hypertension 2, high blood viscosity: blood viscosity is too high, there will be a slowdown in blood flow phenomenon, easy to cause a lack of local blood supply or blood vessel wall elasticity decline, easy bleeding caused by nerve compression caused by the mouth numb. Especially when middle-aged and elderly female patients have sudden numbness of lips, they should first consider hypertension causing bleeding leading to stroke, which will compress the brain parenchyma and produce numbness in the mouth, usually accompanied by numbness in one side of the limb; 3, peripheral neuropathy: facial nerve compression or inflammation due to infection or trigeminal nerve damage, which needs to be examined and clarified; 4, lip cancer: lip cancer is commonly caused by ultraviolet light. The cause of lip cancer is usually ultraviolet radiation or the long-term effect of stimulating factors, female patients often have lip mucosal ulcers, bleeding and numbness of skin around the mouth.