Colds tend to occur in the winter and spring cold seasons, and coughing and sneezing often occur after a cold, however, many elderly people have had the experience of flashing their waist when coughing or sneezing. The waist is an important part of the human body, and the lumbar intervertebral joints of the elderly have degenerated, the inter-articular ligaments have relaxed, and the strength of the lumbar muscles has weakened, making it easy for the lumbar spine to become unstable, especially for the elderly who have abnormal curvature of the lumbar spine, which is heavily loaded. The process of coughing or sneezing is a contraction of the diaphragm to descend, a short inspiration, followed by the closure of the vocal hatch, a strong contraction of the expiratory muscles, a rapid rise in intrapulmonary pressure, and then a sudden opening of the vocal hatch, resulting in coughing or sneezing. During this process, the intra-abdominal pressure rises sharply and then falls rapidly. The diaphragm has two diaphragmatic angles starting from the 1st to 3rd lumbar vertebrae, and during coughing or sneezing, the strong contraction of the diaphragm pulls on the lumbar vertebrae. Therefore, when the elderly cough or sneeze, when there is body distortion or lumbar scoliosis, the pressure imbalance of the load on both sides of the lumbar vertebrae makes it particularly easy to injure the lumbar vertebrae or lumbar muscles. Crossing the waist helps stabilize the lumbar region, and in order to avoid lumbar injury, it is therefore best to cross your arms when coughing or sneezing.