Sitting legs often numb may be caused by bad sitting posture, may also be lumbar disc herniation, diabetes. 1. Bad sitting posture: sitting for too long, stilts legs and other reasons, may lead to local blood circulation is not smooth, thus appearing leg numbness. Avoid sitting for a long time and maintain a good sitting posture, the symptoms of leg numbness can be gradually relieved. 2. Lumbar disc herniation: In lumbar disc herniation, the protruding nucleus pulposus or intervertebral disc may extrude to the surrounding nerve root, which may cause numbness in the legs, in addition to numbness in the legs, often accompanied by leg pain. 3. Diabetes: If you suffer from diabetes, in the case of long-term blood sugar control is not good, it may lead to the occurrence of peripheral neuritis, and thus the occurrence of leg numbness. If you often have numbness of the legs, exclude physiological bad sitting posture, we should consult the doctor to identify the cause of the disease, and follow the doctor’s instructions to take standardized treatment.