Herniated lumbar disc with no back pain but numb feet is usually caused by nerve root compression. Lumbar disc herniation patients do not have back pain because the patient may be peripheral lumbar disc herniation, the patient’s protruding lumbar disc mainly protrudes to the posterior side, and will not compress the nerves innervating the lumbar region, so it will not cause back pain. When the herniated lumbar intervertebral disc compresses the nerve roots innervating the lower limbs, it tends to cause sensory abnormalities in the area innervated by the nerves, so the patient will have no back pain but leg pain and numbness of the feet. It is also possible that after a period of time of treatment, local inflammation is reduced, so the lumbar localization does not feel obvious pain, but the peripheral nerves are still compressed, so the feet will still feel numbness. If patients with this symptom should promptly go to the hospital for examination, targeted treatment under the guidance of the doctor.