There are more reasons for right-sided low back pain, which may be caused with right kidney stone, lumbar disc herniation, right-sided lumbar muscle strain and so on. 1. Right kidney stone: If the stone is embedded in the kidney, it will irritate the mucous membrane inside the kidney and cause edema of the kidney. It will cause spasm of the kidney and fluid accumulation, etc. All of them will cause right-sided low back pain. 2. Right side lumbar muscle strain: Repeating a certain kind of movement, overwork, overbending, may lead to right side lumbar muscle strain, forming aseptic inflammation, thus causing right side pain. 3. Herniated lumbar intervertebral disc: In the long-term external force, heredity, pregnancy and other reasons, leading to the intervertebral disc’s fibrous ring rupture, so that the nucleus pulposus tissue will be protruded from the rupture site, and the adjacent spinal nerve root produces a strong stimulation, which can be manifested as the right side of the back pain. If you have right-sided back pain, it is recommended that you seek medical attention in a timely manner, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.