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Frequent Urination Causes. The constant need to urinate can be caused by many different conditions. Below we have listed the most common conditions associated with frequent urination: Urinary tract infection - This is the most common cause of frequent urination, affecting millions of women and men annually.
The three main causes of urinary retention in women are a hypotonic bladder, dysfunctional voiding, and vaginal prolapse. A hypotonic bladder muscle, also called a lazy or neurogenic bladder, does not contract (squeeze) hard enough during urination to empty the bladder completely. Dysfunctional voiding is a condition in which the muscles around the urethra do not relax enough during urination to allow urine to pass freely.