Numbness of legs and feet is usually caused by bad posture, lumbar spondylosis, central lesions and other reasons. 1. Bad posture: sitting, standing, squatting and other bad postures cause poor blood circulation in the legs, so that the peripheral nerves are compressed, affecting the normal nerve conduction, resulting in numbness of the legs and feet. 2. Lumbar spine disease: lumbar disc herniation, lumbar spinal stenosis, lumbar spinal stenosis, lumbar spinal canal swelling and other lumbar spine diseases compress the spinal cord or nerve roots, causing lumbar pain and accompanied by numbness in the legs and feet. 3. Central lesions: cerebral infarction, cerebral hemorrhage, intracranial tumors and other central lesions can damage the sensory system of the lower limbs in the central system of the projection site, resulting in sensory abnormalities in the distal part of the lower limbs, which may cause numbness of the legs and feet. The situation of numbness of legs and feet can be relieved by appropriate rest, if the symptoms recur, can not be relieved, should consult a doctor in time, under the guidance of the doctor to clarify the diagnosis and correct treatment.