Numbness of the dorsum of the foot may be caused by compression factors, acute injury, lumbar disc herniation, peripheral neuritis, vascular lesions and other factors. 1. Compression factors: the dorsum of the foot has been compressed for a long time, which may lead to blood flow, there will be physiological numbness of the dorsum of the foot, and after lifting the compression, it can usually be improved on its own. 2. Acute injury: such as external blows and acute sprains, resulting in damage to the ankle and instep, may cause serious damage to the nerves, which will cause numbness of the instep, and there will be local pain, swelling and other symptoms. 3. Lumbar disc herniation: when the lumbar disc herniation disease aggravates, it may compress and stimulate the nerve root, which may easily cause numbness in the calf and the back of the foot, accompanied by lumbar pain, radiating pain in the lower limbs and other symptoms. 4. Peripheral neuritis: related to various factors, such as infection, vitamin B deficiency, diabetes, etc., may lead to damage to the peripheral nerves, which may cause numbness in the back of the feet and toes, and may be accompanied by sensory loss. 5. Vascular lesions: for example, occlusive vasculitis, varicose veins of the lower limbs, etc., may lead to poor blood circulation in the dorsal part of the foot, which may easily cause numbness in the dorsal part of the foot, and may be accompanied by obvious swelling. Numbness of the back of the feet for a long time, there are other clinical symptoms, may be the existence of disease factors, it is recommended that timely medical examination and treatment.