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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.
An enlarged prostate can press against the urethra (the tube that carries urine out the body) and block the flow of urine. This causes the bladder wall to become irritable. The bladder begins to contract even when it contains small amounts of urine, causing more frequent urination. Interstitial cystitis .