Poor peripheral blood circulation is mainly manifested in coldness and numbness of the distal limbs, dark and blue skin color, chest tightness and shortness of breath. 1. Coldness and numbness of the distal limb. Poor peripheral blood circulation in the distal limbs is commonly caused by excessive compression after trauma bandages, blood vessel blockage or spasm. Coldness and numbness are typical manifestations of ischemia and should be kept warm accordingly. 2. Skin color is dark and blue. Poor circulation leads to local ischemia and then hypoxia, in the absence of oxygen, local tissues will appear dark skin color, blue and purple phenomenon, this situation is called cyanosis. This condition is called cyanosis. It can be treated with medication to improve microcirculation. 3. Chest tightness and shortness of breath. The capillaries in the lungs are rich and fragile, poor peripheral blood circulation will lead to poor gas exchange, affecting the blood oxygen saturation, resulting in the phenomenon of chest tightness and shortness of breath. Peripheral blood circulation can observe the color of nails, skin color, temperature and sensation, and also pay attention to whether there is chest tightness and shortness of breath, if there are adverse symptoms to seek medical attention.