The right side of the back pain caused by leg pain may be lumbar disc herniation, lumbar spine tumor lesions and infectious lesions, spinal stenosis and so on. 1. Lumbar intervertebral disc herniation: it is common among young and middle-aged people, mainly caused by overstrain of lumbar back and degenerative changes of intervertebral discs, and accompanied by pain and numbness in the right side of the lower limbs, fatigue, and muscular atrophy of the lower limbs and other symptoms. 2. Tumor lesion and infectious lesion of lumbar vertebra: the leg pain caused by right side lumbar pain may be due to the local tumor occupying the position or the local infectious lesion compressing the corresponding nerve root. 3. Vertebral stenosis: due to a variety of reasons lead to the narrowing of the spinal canal, so that the dural sac, spinal cord or nerve roots are squeezed, resulting in nerve dysfunction, pain, limb weakness, numbness, claudication and a series of neurological dysfunction of the disease. The right side of the waist pain caused by leg pain for many reasons, need to go to the hospital for a detailed examination to determine the cause of the disease and then targeted treatment.