Cold is too heavy when the blood stagnation is not smooth, the hands and feet lost in warmth and moistening may appear inside the hands and feet swelling and pain phenomenon. Cold is Yin evil, easy to damage the human body yang qi, its nature of cold, collect and attract stagnation, the main pain, so the cold evil attack on the human body, damage to yang qi, can make the meridians stagnation, muscle surface coupling (pores), such as contraction contracture of the limbs, qi, blood, fluids and fluid run stagnation, can not be warmed up the organism, especially hands and feet and other end parts of the body, so that the joints of the limbs and other constrictions, cold hands and feet, such as distention and pain symptoms. Swelling and pain in the hands and feet can be seen in the cold excessively stagnant collection of meridians, blood veins, etc., such as the emergence of medical treatment should be promptly and correctly dealt with, in order to prevent frostbite or qi and blood stagnation (qi and blood transport is not smooth, blocked stagnation) leading to necrosis of the limbs and so on.