Right side lumbar flank pain may be related to lumbar disc herniation, lumbar muscle strain, kidney disease, ureteral stone and so on. 1. Lumbar disc herniation: when the herniated lumbar disc compresses the right side nerves, it can be manifested as right side lumbar flank pain, and when the pain is severe, it can also lead to limited lumbar activities. 2. Lumbar muscle strain: when keeping a posture for a long time for work and labor, it can cause lumbar muscle strain, and when it occurs in the right side of the waist, it will be manifested as right side lumbar flank pain. 3. Kidney disease: because the kidney is located in the retroperitoneum, if the kidney is damaged or there is inflammation and other diseases, it can be manifested as lumbar pain, when the right side of the kidney is diseased, it will be manifested as the right side lumbar flank pain, which is often accompanied by fever, fatigue, proteinuria, hematuria, and so on. 4. Ureteral stones: when stones occur in the right ureter, it can be manifested as flank pain in the right side of the waist, and the pain is more intense, can be radiated to the periphery, and is persistent or intermittent. 5. Other diseases: such as cholecystitis, cirrhosis, ankylosing spondylitis, rheumatic diseases, etc., may lead to the right lumbar flank pain. There may also be other causes of right lateral lumbar pain, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.