Waist often flash to the following reasons: First, weak lumbar muscle strength: mainly young women and elderly patients, usually rarely participate in physical exercise, lumbar muscle strength is insufficient, easy in the activity of the waist often flash to the clinical symptoms, and manifested as lumbar pain, limited activity. Usually strengthen the lumbar muscle strength training, can prevent such symptoms. Second, the lumbar spine small joint disorder: if long-term sitting, standing posture is bad, easy to cause the lumbar spine small joint disorder, the lumbar spine small joint lost the normal relationship, in the activity is also easy to appear often flash to the clinical symptoms. Paying attention to correcting bad posture and strengthening the protection of the lumbar region can prevent the symptoms from occurring. Patients who often have clinical manifestations of flashing lumbar should be diagnosed and treated early, otherwise it is easy to induce serious lumbar spine pathologies such as lumbar disc herniation.