The right lumbar flank pain may be caused by acute lumbar sprain, lumbar muscle strain, ligament injury, lumbar degenerative disease, lumbar peripheral inflammatory lesions, renal lesions and so on. 1. Acute lumbar sprain: sudden turning can cause the small joint space on one side to increase, generating negative pressure, resulting in synovial membrane being pinched at the joint, causing severe pain in the lumbar region. 2. Lumbar muscle strain: Accumulative, mechanical, chronic injury to the muscles of the right side of the waist, manifested by recurrent right-sided lumbar pain or swelling. 3. Ligament injury: long-term stooping workers or the spine is unstable due to injury or disease, the supraspinous and interspinous ligaments are often in a tense state, resulting in small tearing injuries, hemorrhage and exudation, which can lead to the occurrence of the right side of the lumbar pain. 4. Lumbar degenerative diseases: including lumbar disc herniation, lumbar spinal stenosis, etc., due to the compression of the nerve root, can cause lumbar pain. 5. Inflammatory lesions around the lumbar vertebrae: such as spinal tuberculosis, septic spondylitis, etc. The stimulation of inflammatory factors can lead to pain in the lumbar region and limitation of activities. 6. Kidney lesions: such as nephritis, renal tuberculosis, kidney stones, etc., the kidney is located on both sides of the spine, living in the peritoneum behind the right kidney lesions, pressure or percussion of the area often have pain. It is recommended that people with right-sided lumbar pain consult a doctor in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.