Double lower extremity numbness, numbness may have nerve damage, clinically the most common diseases that cause these symptoms are the following: 1, spinal stenosis compression of the nerves, specific lesions in the lumbar spine. 2, long years of diabetes leading to peripheral nerve or vascular lesions. 3, thrombo-occlusive chorioretinitis, because of the poor blood circulation supply, the nerves are more sensitive, there will be numbness of the symptom, but the disease of double lower extremity Progressive pain is more obvious, and the coldness of the limbs will also be more obvious. But no matter which of the three diseases mentioned above, these diseases have been more serious, should actively go to the hospital to do the appropriate examination, to clarify the characteristics of the disease and the severity of the disease, to take active treatment program, do not delay, the more delayed the lesions progress faster, to the late treatment methods will be more ineffective.