If the hot pack salt bag is not damp, it can generally be used between 3 to 5 years; if the hot pack salt bag is damp, it is generally used for about 3 months. Hot salt bag is the edible salt fried, put into the inside of coarse cotton cloth, wrapped, and then applied to the affected area or acupuncture points, blood circulation, reduce blood stasis, alleviate pain effect. However, the temperature should be tested before applying the hot compress, and it is forbidden to apply the hot compress bag with too high temperature directly to the skin to avoid burns. If the skin is broken, acute enteritis and the initial stage of pregnant women are not recommended to apply hot packs of salt, so as not to produce physical discomfort. Usually pay attention to waterproof moisture, generally can be used between 3 to 5 years, after each use need to wait for the hot packs dry and cool and then sealed and stored, should try to avoid the raw material of coarse salt moisture absorption, so that the service life of the hot salt packs can be extended. If the cloth surface of the hot salt bag is wet, can be promptly placed in the sun to dry, but not for a long time in the sun, can be used for about 3 months. Soft tissue injury patients or sprains in the early stages of patients and other cases should consult a doctor to use, so as not to aggravate the condition or cause adverse consequences.