It is believed that many people have the experience of "flashing waist", when carrying objects or turn around without thinking, suddenly feel a pain in the waist. Then the lumbar stiffness, standing, sitting activities are limited, lying down when turning over difficult, coughing, breath holding can make the pain worse. In fact, to cope with this situation, it is advisable to first use ice cold compresses on the waist, and then hot compresses to adjust. Flash waist, in fact, is the lumbar acute sprain, the cause is the lumbar muscles, fascia, ligaments and other soft tissues, by the external force sudden excessive tension and cause, but the lumbar vertebrae bone is no abnormality. Sometimes the strong contraction of the ligament produces damage, the disc in the damaged area to the back of the lateral protrusion, compression to the spinal nerve, thus causing pain symptoms. Once a flashback occurs, the patient needs to immediately take a prone position to allow the muscles of the whole body and the ligaments of the lower back to relax. When lying in bed, the lumbar region with a cushion or add a soft pillow, in order to maintain the physiological curvature of the lumbar spine anterior convexity. The lumbar muscles are in a state of relaxation and rest, which is conducive to the recovery of the damaged parts. It should be pointed out that the bed should choose a hard board bed, the top can be a layer of cushion, but do not sleep in a soft bed, soft bed below the unsupported, the vertebral body due to gravity downward bending, increased compression on the spinal nerves, and at the same time the damaged tissue is difficult to recover. The first two days after the flashback suitable for cold compresses, prompting the rupture of small blood vessel contraction hemostasis, the method is to ice crushed in a plastic bag, wrapped in a towel, applied to the painful parts. After two days can be hot compresses, or physical therapy (such as ultrasound, infrared, pulse wave) and massage, cupping, acupuncture, pain points closed. Folk have a hairdryer to blow the affected area, the heater close to bake the affected area, with fried hot salt or sand wrapped in a cloth bag, compress in the sprain, can also be effective in relieving pain