There are several possible causes of numbness in the legs and feet when walking: first, pear-shaped muscle syndrome, pear-shaped muscle syndrome can compress the sciatic nerve in severe cases, resulting in numbness and pain in the lower limbs, then we should conduct relevant physical examination and electromyography for early diagnosis and treatment; second, lumbar disc herniation, patients with lumbar disc herniation can also have symptoms of numbness in the legs and feet when walking, often due to compression of the nerve roots. Third, lumbar spinal stenosis, lumbar spinal stenosis can also compress the nerve, resulting in symptoms of numbness in the legs and feet, especially when walking is very obvious, often with limp symptoms; fourth, lumbar spine slippage, serious lumbar spine slippage can compress the nerve root, resulting in numbness in the legs and feet when walking, then early lumbar spine X-ray, CT, nuclear magnetic examination for diagnosis. CT and MRI examinations should be performed early to make a diagnosis.