Holding back urine is generally not beneficial, except sometimes when you need to hold back urine during hospital checkups, you should develop the habit of urinating regularly. There are many dangers of holding back urine, and the main dangers can lead to urinary tract infections and even chronic kidney disease. Urine is produced uninterruptedly, usually from the renal tubules, collecting ducts and then the ureter after entering the bladder, urine in the bladder once the storage volume reaches about 250 ml, the person will have a reflexive urinary response, the urine from the urethra. Prolonged holding of urine will lead to retrograde urine, and the bacteria contained in the urine will also retrograde to the renal pelvis, thus causing reflux nephropathy, causing damage to the kidneys, and even triggering kidney failure. Holding urine for a long time can also lead to phenomena such as poor urination. Holding back urine can also cause the occurrence of abnormalities such as urinary fainting and female uterine ectopic. To summarize, holding urine is a bad habit, and patients are advised to try to develop the habit of regular urination to avoid unnecessary damage. Of course, under certain special circumstances, such as gynecological ultrasound examination, performing bladder sphincter exercise, etc., urine holding should be performed under the guidance of a doctor.