In mild cases, it takes about 1~2 weeks to get well naturally, and in severe cases, it takes about 2~3 months to get well. Flash waist light will cause lumbar muscles, ligaments and other soft tissue damage, in the early stage of injury will appear internal bleeding and aseptic inflammation, the middle of the bruises gradually absorbed inflammation subsides, the late damage to the tissues will be gradually repaired, the process is generally 1 ~ 2 weeks or so. If the damage is more serious, it may cause avulsion fracture and other injuries, avulsion fracture general conservative treatment, 2~3 months or so can be good. After the flash waist should pay attention to rest, can immediately local cold compress, help relieve swelling and pain, in life should pay attention to protect the waist, the upper body does not bear weight, such as not lifting heavy objects. Flash waist patients should go to the hospital in time for standardized diagnosis and treatment, so as not to delay the condition.