Long-term cross-legged, there are the following two more common hazards: First, the performance of the lower limb deep vein reflux abnormalities, long-term cross-legged, is compressed in the upper leg of the venous reflux will be seriously obstructed, serious will form the lower limb deep vein thrombosis, thrombus once dislodged, into the circulation will easily lead to pulmonary embolism. The probability of thrombosis is very high when you cross your legs for a long time. Second, long-term crossed legs will also lead to poor sitting posture, once poor sitting posture, is bound to easily lead to lumbar disc protrusion.