One side of the back pain is caused by a variety of reasons, common lumbar trauma, infection, can be seen in the lumbar disc herniation and other lumbar spine diseases, but also can be seen in the unilateral urinary stones, infections, etc., female patients with pelvic inflammatory disease and other gynecological diseases can also cause one side of the back pain, the specific cause of the need to go to the hospital to confirm the diagnosis. 1. Lumbar trauma: there is a clear history of trauma, mostly on one side of the lumbar muscle strains, sprains and contusions. 2. Infection: mostly superficial skin infections on one side of the waist, such as boils, sebaceous cyst infections, etc., can also be seen on one side of the waist of herpes zoster. 3. Lumbar spine disease: the more common clinical lumbar disc herniation, lumbar spinal stenosis, lumbar spine tumors, etc., when the lesion stimulates the lumbar nerve on one side, it can lead to pain in the lumbar region of one side. 4. Urological diseases: more common for one side of the kidney, ureter stones, inflammation or tumors, etc., dealing with one side of the lumbar pain, accompanied by abdominal pain, hematuria, urinary frequency and other symptoms. 5. Gynecological diseases: female patients with lower back pain on one side, can also be seen in pelvic inflammatory disease, adnexitis and other gynecological diseases. It is recommended that the patient go to the hospital for examination to clarify the cause of the disease, and the professional physician will give the appropriate treatment for the condition.