The blue face of the elderly indicates the possible existence of liver disease, anemia, lung disease or cardiac insufficiency. It is recommended to take the elderly to the hospital in time to clarify the cause and then take targeted treatment measures.1. Liver disease: When the elderly suffer from hepatitis, cirrhosis and other diseases, it may cause liver function damage, so that the blood purification function decreases, which in turn causes the phenomenon of a blue face. In this regard, liver-protective drugs can be used for treatment, such as dicyclomine, but also hemodialysis treatment, if necessary, liver transplantation treatment; 2, anemia: when the body is in a state of anemia, the body’s blood circulation is insufficient, insufficient blood supply to the head and face, it may appear the phenomenon of blue face. Diet, more lean meat, egg yolk and shellfish are needed to replenish iron and protein and thus improve iron-deficiency anemia, as well as more vegetables and fruits to replenish folic acid and vitamin B12 to improve megaloblastic anemia. If severe anemia occurs, blood transfusion therapy is required, and the cause of the anemia is actively identified and the primary disease is treated; 3. Lung diseases: such as chronic bronchitis and chronic obstructive pulmonary emphysema can lead to pulmonary insufficiency, causing a decrease in oxygen saturation, resulting in the body being in a state of hypoxia, and thus the phenomenon of blue face. In this regard, you can actively carry out targeted treatment, such as oxygen, the application of inhaled glucocorticoids and anti-inflammatory drugs, etc.; 4, cardiac insufficiency: when the elderly cardiac insufficiency, will lead to a decrease in oxygen saturation of arterial blood, resulting in the phenomenon of blue face. In this regard, cardiac strengthening, diuretic and vasodilator treatments are needed to improve cardiac function and thus relieve the symptoms of cyanosis in response to the specific causes.