Crossing legs may cause anterior pelvic tilt, herniated lumbar disc, scoliosis, knee damage, varicose veins, venous thrombosis and other hazards. 1. Lead to anterior pelvic tilt: Long-term leg-crossing will cause the original balance of the muscles around the pelvis to be broken, thus causing anterior pelvic tilt. 2. Lead to lumbar disc herniation: when crossing legs, the body will tilt the upper body in order to maintain balance, which in the long run will result in the scoliosis of the spine, and even lead to herniation of the lumbar disc if it is serious. 3. Lead to knee cartilage damage: long-term legs will lead to knee joint pressure rise, and then wear and tear on the knee joint, damage to the knee cartilage. 4. Lead to varicose veins: when you cross your legs, the popliteal vein and popliteal artery will be compressed. Since the veins are more easily squeezed than the arteries, it will be unfavorable to the blood return in the veins, which will easily lead to varicose veins, and it is easy to form venous thrombosis in a long time. For people who love to cross their legs, it is recommended to change this habit as soon as possible to avoid affecting your health.