الفهرس 
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Abstract
Urinary frquency is common sign of early pregnancy. This is due to pressure exerted on the bladder from the enlarging uterus. However,as the uterus rises up out of the pelvis ,the bladder capacity is reduced and urinary frequency decreases. However, urinary frquency often recurs late in the third timester as the fetal head engages, increasing the pressure on the bladder and causing a reduction in the bladder capacity (Thorp JM et al., 1999).
There is a strog association between pregnancy and delivery and the development of urinary symptoms; however the pathophysiology is poorly understood . Urinary incontinence may result from a combination of factors, including pudendal berve damage, muscle trauma and change in urethral support (Chaliha C et al.,2000).
Pregnancy and delivery cause transient urinary incontinence in a considerable number of woman. Until now, it is not clear to what extent pregnancy itself or vaginal delivery contributes to the development of urinary incontinence(Wijma J et al.,2003).
It is widely recognized that vaginal delivery may cause damage to pelvic floor structure and function. Studies examining pelvic floor muscle strength and pelvic floor relaxation befor and after childbirth in individual patients are rare (Peschers U et al .,1996).