A lumbar flash is an acute lumbar sprain, and if it is not treated systematically, there is a risk of sequelae. After the appearance of lumbar sprain, bed rest is required. If you do not rest and continue to move, it will lead to further strain on the location of the injury, which will form an accumulation of inflammatory lesions, and the inflammatory metabolites will stimulate the peripheral nerves around the area and produce significant pain. If the strained area is not treated with bed rest and medication, the injury will not heal over time, and after a long period of time, the injured end will become sclerotic, inflexible, and lacking in toughness, which may lead to re-injury of the previously injured area when it is cold, holding a posture for too long, or bending over to lift heavy objects, also called habitual strain. The blood circulation is often slowed down in the cooled state, and the inflammatory metabolites gradually accumulate, leading to adhesions, hyperplasia and calcification in this area, which can lead to further aggravation of the condition.