Flash back is a common saying of the people, medically known as acute lumbar sprain, often due to the patient’s waist violent twisting, causing partial tearing of the lumbar muscles caused by a series of symptoms such as lumbar pain. The most basic requirement for the patient at this time is to rest in a flat hard bed, do not try to bend over and bear weight again, it is best to lie in a hard bed. Topical spraying of Yunnan Baiyao aerosol and oral administration of Yunnan Baiyao capsules or non-steroidal anti-inflammatory and analgesic drugs such as Fenugreek capsules, Celecoxib capsules, Loxoprofen capsules, Meloxicam, etc. can be used topically. It is best to rest in bed for about 10 days to half a month, and then try to get up wearing a waist brace. If the symptoms are still not relieved, you need to go to the hospital for further examination such as X-ray or CT.