Purple finger joints may be caused by emphysema, varicose veins, hemangioma and other reasons. 1. Emphysema: Emphysema will lead to lower oxygen level in the body, the fingers are located at the end of the limbs, so the oxygen content of the blood in the fingers is even lower, and the content of hemoglobin binding oxygen is also reduced, which will lead to purple finger joints. 2. Varicose veins: Varicose veins will cause blood flow obstruction, venous blood will be deposited in the distal part of the limb, which will lead to purple finger joints. 3. Hemangioma: Hemangioma is a proliferation of blood vessel tissues, resulting in poor blood circulation, which can lead to purple finger joints. Purple finger joints can also be caused by other reasons, such as Raynaud’s disease, chronic bronchitis and other diseases, if the symptoms of purple finger joints continue to be unrelieved, you need to consult a doctor for timely treatment.