The causes of leg numbness and foot numbness are mainly considered from several aspects such as diabetic peripheral neuropathy, lumbar disc herniation, Green-Barre syndrome, and somatic disorders, as follows: 1. diabetic peripheral neuropathy: if the patient has a previous history of diabetes and has numbness in both legs or feet with symmetrical distribution, consider the possibility of diabetic peripheral neuropathy, and electromyography can be performed; 2. lumbar disc herniation If the patient has numbness in the legs and feet, if the numbness is unilateral, a lumbar magnetic resonance examination should be performed to find out whether there is numbness in the legs and feet caused by lumbar disc herniation; 3, Green-Barre syndrome: if the patient has numbness in the legs and feet, bilateral symmetrical progression from distal to proximal, accompanied by weakness of the limbs, electromyography and lumbar puncture examination should be performed at this time to find out whether there is Green-Barre syndrome; 4, somatic disorders: patients with leg numbness, foot numbness, if the time and location are not constant, intermittent, ask the patient whether there is a sleep disorder, there is no other physical discomfort, you can assess the anxiety and depression scale to understand whether the patient has a somatization disorder.