Foot numbness can be caused by the following reasons: First, lumbar disc herniation, when the lumbar disc herniation compresses the nerve root, the symptom of foot numbness can appear, and this time, we need to carry out lumbar spine CT, nuclear magnetic examination for diagnosis and treatment. Second, lumbar spinal stenosis, lumbar spinal stenosis, hyperplasia of bone spurs and protruding discs can irritate and compress the nerve root, resulting in symptoms of numbness. Third, pyriformis syndrome, pyriformis syndrome can compress the sciatic nerve in severe cases, and there is numbness of the feet, which should be diagnosed by relevant physical examination and neuromuscular electromyography. Fourth, the peripheral nerves of the card pressure, such as the peroneal nerve in its course of compression, there will be numbness of the feet, this time to carry out physical examination and related electromyography for diagnosis and treatment. Fifth, peripheral neuritis, peripheral neuritis can also appear foot numbness, often bilateral symmetrical numbness.