By eHow Health Editor
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A urinary tract infection may involve the lower urinary tract, which includes the urethra and bladder, or the upper urinary tract, involving the ureters and kidneys. They can be serious if left untreated but are very common, especially among women. Infection occurs when microorganisms enter the urethra and multiply in the normally sterile environment of the urinary tract. Look for these symptoms if you suspect a urinary tract infection.
eHow Health Editor