Flash to the waist usually refers to lumbar myofascial and lumbar spinal ligament, interspinous ligament injury, can appear lumbar pain and activity restrictions, healing needs a process, pain can usually last about 1 week. Acute lumbar sprain in most cases for the ligament muscle soft tissue injury, usually the patient bed rest 3-7 days, give hot compress, relieve muscle spasm, pain serious oral diclofenac sodium and other non-steroidal anti-inflammatory drugs analgesic treatment, most 1 week can be healed. However, if the ligament damage is more serious, the time can be extended to about 3 weeks. Patients are advised to sleep on a hard bed, avoid sleeping on a soft bed, and apply cold compresses within 48 hours after the sprain and hot compresses after 48 hours in order to make the soft tissue repair as soon as possible and relieve pain. In conclusion, patients are advised to rest, avoid excessive activities to avoid secondary muscle damage, give local anti-inflammatory and analgesic creams or aerosols for treatment, and carry out rehabilitation under the guidance of a doctor.