Salt packs of hot compresses for a long time, there is no obvious adverse effects, but need to pay attention to the prolonged hot compresses caused by low heat burns. Salt packs of hot compresses is to promote local tissue blood circulation through hot compresses, improve tissue edema, local inflammation, belonging to the physical treatment, the use of long time most of the adverse effects will not be obvious, but the general recommendation is that 20 ~ 40 minutes. Salt packs of hot compresses, pay attention to control the temperature of the salt packs, prolonged low heat hot compresses can also cause burns, try to control the temperature below 45 degrees. In addition, for patients with underlying diseases, such as diabetes, the temperature of the salt packs should be more careful, often accompanied by sensory abnormalities, more prone to burns. Salt packs should be used under a doctor’s supervision to avoid low-temperature burns.