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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 infection can cause lower back or rectal pain and frequent urination, as well as: painful urination; painful ejaculation; pain around the scrotum and penis; chills; fever; muscular pain; fatigue; Other causes. Other causes of back pain and frequent urination may include: weight gain; hyperparathyroidism; ovarian cysts; bladder or prostate cancer; uterine or ovarian cancer; pyelonephritis; pelvic abscess; Cushing syndrome