Urethral hypermobility occurs when too much movement is placed on the urethra, causing it to drop below the pelvic floor muscles during certain activities. This may cause urine leakage in some women. When the pelvic muscles’ support is relaxed or lost, the bladder neck and urethra may shift, sag or drop into a lower position during periods of activity, thus causing pressure on the bladder neck area. The pressure on the bladder will exceed the pressure on/in the urethra. If the bladder neck or urethra opens briefly, urine leakage occurs.