Back pain after holding urine may be caused by urine reflux, but also may be caused by urinary tract infection, urinary stones and other reasons. Normal people have a large amount of urine in the bladder, if it is not discharged in time, it can lead to urine reflux caused by hydronephrosis, resulting in back pain, there are serious prostate hyperplasia, urethral stenosis, or neurogenic bladder patients, but also easy to reflux urine. If there is a urinary tract infection itself, bacteria can enter the renal pelvis after holding back urine leading to acute pyelonephritis, which can cause back pain, fever, frequent urination, urgency, painful urination and other symptoms. Urinary stones can also cause back pain due to increased tension in the ureter after holding urine. Therefore, if back pain accompanied by abnormal urination occurs after holding urine, it is recommended that the patient go to the hospital in time to identify the cause of the disease and then decide on the appropriate treatment.