The causes of weak feet are mainly the following: 1, causes of the central brain, various causes of cerebral ischemia, dizziness, feet like stepping on cotton, limb weakness, unstable walking and other symptoms, can improve the blood circulation in the brain to achieve the purpose of treating the disease. 2, peripheral nerve problems, mostly seen in the bilateral lower limb foot nerve problems, lower limb nerve dystrophy, more common is the lumbar disc 3, systemic causes, more common are electrolyte disorders, the sequelae of diabetes, etc., need to be diagnosed by the doctor under the premise of the relevant examination, in order to clarify the direction of treatment.