Red lips: normal lip color is mostly pink, if the red color is too bright or deep purplish red, it is a flushing of the mouth and lips. Under pathological conditions, such as the occurrence of oral mucosa inflammation, or bacterial infectious diseases, cardiovascular diseases, digestive system diseases, etc. Etiology: In general, it may be caused by what is commonly known as “fire” in the body. If it is accompanied by bad breath and erratic, it means damp heat in the spleen and stomach; if it is accompanied by distension and pain in the two sides and anorexia, it means that the liver fire is too strong. Pathological conditions such as inflammation of the oral mucosa, bacterial infectious diseases, cardiovascular diseases, digestive system diseases, etc. may also be associated with this symptom. Diagnosis: For patients with flushed lips, there are many causes of the symptom. The color, luster, and texture of the lips change without fail to reflect the health status of the body. Once the lips have changed, it may indicate a physical problem. Pathological causes, such as inflammation of the oral mucosa, or bacterial infectious diseases, cardiovascular diseases, digestive system diseases, etc. may also accompany the appearance of this symptom. Therefore, when making a diagnosis, attention should be paid to the examination and confirmation of the diagnosis in conjunction with the functional status of the whole body to avoid missing or misdiagnosis.