Numbness of feet may be caused by physiological numbness due to localized pressure, or it may be the manifestation of certain diseases, such as lower extremity vascular disease, peripheral neuropathy, sciatic neuropathy and lumbar spine lesions. 1. Physiological numbness: If the buttocks or both lower limbs are pressurized, it can cause physiological numbness of both feet, which can be relieved after changing postures and resting. 2. Lower limb vascular disease: such as phlebitis and varicose veins in the foot or lower limb, which leads to circulatory disorders in the lower limb and poor blood supply, resulting in abnormal sensation and numbness. 3. Peripheral neuropathy: such as diabetic peripheral neuropathy, diabetic foot, etc., leading to peripheral neuropathy, abnormal sensation and numbness of the feet. 4. Sciatic neuropathy: Damage to the sciatic nerve leads to sensory abnormalities in the lower limbs and feet under its control, which may be manifested as numbness in both feet. 5. Lumbar spine lesions: such as lumbar disc herniation, lumbar spinal stenosis and other compression of the nerve root, can also appear in both feet numbness symptoms. The causes of numbness of the feet are more and more complex, such as cerebrovascular disease, involving different organs and systems, if you exclude physiological numbness, it is recommended to go to the hospital as early as possible, complete the relevant examinations, clear the cause of the cause of the disease under the guidance of the doctor for further treatment, so as to avoid deterioration of the condition.