Cheek redness may be caused by physiological factors, environmental factors, skin allergies, abnormal cardiorespiratory function and other reasons. 1. Physiological factors: Hot weather, emotional stress or intense exercise within a short period of time may lead to redness of the cheeks. 2. Environmental factors: Due to frequent outdoor work, prolonged exposure to ultraviolet radiation may lead to redness of the skin on the face. Or a sudden change from a cooler environment to a warmer one may lead to a sudden expansion of the blood vessels under the skin, resulting in redness of the cheeks. 3. Skin allergies: The use of allergy-prone cosmetics, skin care products and cleansers may lead to increased skin sensitivity and allergic reactions to cold air or dust, resulting in redness of the cheeks. 4. Abnormal cardiopulmonary function: Abnormal cardiopulmonary function, such as tuberculosis, pneumonia, mitral stenosis, etc., may lead to long-term redness of the cheeks. There are many causes of redness in the cheeks, so it is recommended that the patient go to the hospital to get a clear picture of the cause of the problem and follow the doctor’s instructions for treatment.