In general, if there is a mild flashback, you can gradually recover within about 1 week. Flash back is also known as lumbar sprain, lumbar sprain after easily lead to lumbar muscles, ligaments edema, pain, will cause lumbar activity is limited. After the general lumbar sprain, the peak period of edema in the injured tissue is about 72 hours, and then gradually decreases and absorbs, in about 2 weeks the swelling of the sprained part will gradually subside and recover, the patient’s lumbar pain will also gradually ease and recover. If the patient is a mild lumbar sprain, cold compress within 24 hours after the sprain, 24 hours after the local hot compress, or the use of blood ointment external compress, generally 4-7 days to recover. During the recovery period of lumbar sprain, patients should limit the activities of the waist and the weight-bearing of the waist to avoid aggravating the edema of the sprained tissue, which is not conducive to recovery.