The salt bag hot compress method has a good effect on patients with wind-cold rheumatism. In fact, this salt bag is not mysterious. It contains coarse salt that we usually use to pickle pickles, commonly known as large grain salt. Salt is a crystal, which contains a variety of mineral components and trace elements and has strong permeability. After heating, it can be applied to joints to get rid of cold and moisture in the body. It doesn't matter if the cloth used for salt wrapping is thinner or thicker, but it is best to use pure cotton cloth, which must be dense and breathable. Use towels or old jeans and trouser legs. Salt packets can be large or small, which is generally done. The bag with a length of 20 cm and a width of 12 cm is the best, and it is smart and convenient to use. It is best to choose pure cotton cloth, which must be dense and breathable. There is no fixed requirement for the size of salt packets, which is convenient for individuals.