Lumbar spine hot compress with salt is useful, but it depends on the specific disease. In the case of lumbar muscle strain, lumbar myofibrosis, lumbar disc herniation, lumbar spinal stenosis, and third transverse process syndrome, etc., you can use salt for hot compresses, which can effectively accelerate local blood circulation and increase arterial blood supply, so that the local energy, nutrients, and electrolytes increase to help the recovery of the lesion. In addition, it can increase the venous reflux, and the increased reflux will promote the metabolism and absorption of the metabolites produced locally, which will help to relieve the symptoms. In addition, hot compresses can also make the muscle tissues more relaxed, thus helping to relieve lumbar pain and other related symptoms. However, when trauma occurs in the lumbar spine, the application of salt hot compresses is not recommended, because the acute phase of trauma will have more small blood vessel rupture and blood seepage, when the salt hot compresses will easily lead to an increase in local bleeding, resulting in more pronounced swelling. When there is an infected lesion in the lumbar spine, hot compresses should not be applied, as hot compresses will lead to the spread of the infected lesion.