Numbness of the right foot when walking is mainly due to the following two reasons: 1, may be due to lumbar disc herniation, lumbar spinal stenosis, or stenosis of the nerve root canal, which will produce extrusion and stimulation of the lumbar nerve roots, which will lead to nerve root ischemia, and numbness in the distal distribution of the relevant nerves in the range of the symptom, the numbness in the right foot is often the lumbar 4, lumbar 5 intervertebral disc herniation, as well as lumbar 5 sacral disc herniation, compression of lumbar 5 and sacral 1 nerve roots. 2, due to the pear-shaped muscle syndrome, this is due to the sciatic nerve from the pear-shaped muscle through, when the pear-shaped muscle strain, strain, inflammation, hyperplasia and fibrous scar tissue, it may be from the middle of the middle through the pear-shaped muscle extrusion, there will be ischemia of the sciatic nerve, the position of the foot will appear numbness symptoms. Therefore, you need to go to the hospital and have an orthopedic surgeon give you a checkup to see the exact location, and have an MRI of the lumbar spine and an MRI of the hip joint to see the exact condition.