Normally, the lumbar pain and weakness in both feet are considered to be caused by lumbar disc herniation, bone spurs, kidney disease and other reasons. Lumbar intervertebral disc herniation is due to long-term bad posture, external damage to the lumbar spine, environmental humidity and other causes of lumbar degenerative changes, lumbar spinal stenosis, herniated nucleus pulposus, such as compression and stimulation of lumbar nerve roots, which can lead to lumbar pain, tenderness of the feet, numbness, and radiating pain in the lower limbs and other conditions. Bone spurs are caused by repeated stimulation of joint aging, external injury, osteoarthritis, gout, etc. They can occur in shoulder, spine, lumbar vertebrae, knee joints, hip joints, etc. If bone spurs occur in the lumbar vertebrae area, it will lead to lumbar pain and leg pain, and tenderness in both feet. Kidney disease is caused by kidney damage due to the abuse of analgesic drugs, excessive drinking, salty diet, frequent late nights, and drinking too little water, etc. It will lead to the patient’s discomfort such as lumbar and knee pain (the feeling of soreness and weakness of waist and knee), weakness of both legs, lumbar pain, and arthralgia. Patients need to go to the hospital in time for the appropriate examination to clarify the diagnosis, and then according to the doctor’s guidance for symptomatic treatment.