Chinese medicine says “cold condenses and stagnates”, the person’s qi, blood and fluids run, depending on the warmth of Yang Qi to promote the smooth flow of unimpeded. When cold invades the body, the qi and blood of the meridians lose the warmth of yang qi, making it easy for the qi and blood to condense and stagnate, astringent and stagnant, and pain is an important feature of the disease caused by cold. Pain due to cold is reduced when the pain is warmed and increased when it is cold, but when it is warmed, the qi rises and the blood disperses, so that the qi and blood can run without obstruction, so the pain is relieved or reduced. Clinically, many joint pain, neck, shoulder, waist and leg pain, dysmenorrhea, indigestion, stomach pain and other diseases are found to be caused by cold, and on the basis of treatment, patients are allowed to apply hot compresses with coarse salt, which has achieved good results. Specific steps are as follows: 1, choose the appropriate coarse salt: 3 to 5 kg of large coarse salt (not fine refined salt for cooking), preferably with large green salt (sea salt), or rock salt, lake salt can also be. 2. Fry the salt hot: Put the loose salt in a pot and fry it hot, and put it into a large cloth bag. This bag is more than 30 cm wide, more than 20 cm wide up and down, made of coarse cotton (do not use chemical fiber fabrics), sewn to death on three sides, one side is not sewn, good for salt, not sewn on the side left a little longer, so as to fold back to prevent salt scattered out. Salt just out of the pot is very hot, you can put a towel under the bag, not too hot when removed. Bag to cover some things to prevent heat dissipation too quickly. 3. Place the salt bag flat on the painful area. You should apply it for half an hour to an hour each time. Do it at least once a day. Such as stomach pain, indigestion, you can compress the upper abdomen and back, such as dysmenorrhea and other gynecological problems, you can compress the lower abdomen and lumbosacral area. The benefits of coarse salt hot compress 1, coarse salt hot compress with blood circulation, accelerate blood circulation, strengthen the role of local resistance. Coarse salt hot compress can make the body local skin temperature rise, muscle relaxation, skin capillary dilation, local and whole body blood circulation can be improved. Moreover, the warm stimulation can activate the phagocytosis of the reticuloendothelial system and promote the metabolism of various substances in the body, which has good effect on various inflammatory reactions. In addition, coarse salt hot compress can also promote intestinal peristalsis, accelerate blood circulation, relieve tissue adhesions and improve local nutrition. 2, the heat of coarse salt hot compress is deeper and more durable than hot water bags. Compared with moxibustion, there is no odor. Easy to operate.