Right lumbar flank pain may be caused by lumbar muscle strain, herpes zoster, kidney disease, lumbar intervertebral disc herniation and so on. 1. Lumbar muscle strain: patients may have right lumbar flank pain due to long-term overloading of the right lumbar region, improper posture, prolonged exposure to cold and so on. 2. Herpes zoster: Early herpes zoster may present with right lumbar flank pain, which is mainly manifested as vague pain or stabbing pain. 3. Kidney disease: for example, right kidney stone, ureteral stone, ureteral inflammation, etc., may cause right flank pain. 4. Herniated lumbar disc: because the herniated lumbar disc may compress the right nerve root, which leads to right flank pain. If the patient’s right lumbar flank pain is not relieved for a long time or has other discomforts, he should go to the hospital in time and follow the doctor’s instructions for treatment.