The common causes of lumbar pain and numbness in the feet are as follows: 1. Lumbar disc herniation: nucleus pulposus tissue compressing one nerve root or bilateral nerve roots can cause reflex pain in the lumbar region, accompanied by numbness symptoms in the lower limbs, especially numbness in the feet. The symptoms can persist and affect the patient’s daily life. CT or MRI can detect disc herniation and nerve compression.2. Lumbar spinal stenosis: The nerve will also be continuously compressed and the patient will have clinical symptoms of lumbar pain and numbness in the feet. The site and extent of the lesion can be found through imaging examinations such as MRI. Early diagnosis and early treatment can provide relief of clinical symptoms of lumbar pain and foot numbness, and if necessary, surgical treatment is needed to remove nerve compression and restore nerve conduction function. Patients should usually strengthen lumbar protection and control their weight to prevent the occurrence of symptoms.