The most direct physiological reason is that the weather is too cold, which causes the peripheral blood vessels to contract and the lips to turn white, while excessive tension and excessive force can be manifested as vasoconstriction and white lips. Cold weather, tension and exertion are all physiological in nature. Some diseases can cause white lips, such as anemia. Anemia is caused by a decrease in hemoglobin content in the blood due to a decrease in hematocrit, and the performance of persistent white lips is due to low hemoglobin content in the blood, which is a disease state. If you have persistent white lips, you should go to the hospital for routine blood tests to clarify the hemoglobin situation and whether there is anemia or other blood disorders. Malnutrition can manifest as white lips and mouth, which is actually related to anemia.