Long time playing mahjong, not only can cause back pain, and may cause sudden death it. Not only playing mahjong, long hours of ambulatory work, computer users, straight back, intervertebral discs and interspinous ligaments for a long time in a state of tension and stiffness, day after day, it is easy to make the back pain and stiffness, can not lie on their backs and turn around. And sedentary will make the pelvis and sacroiliac joints for a long time weight, lack of lumbar activities, affecting the lower limbs blood circulation, numbness in the legs, over time can lead to muscle atrophy, stiffness, a little activity may sprain or cause other injuries, low back pain.