A urinary tract infection (UTI) is an infection in any part of the urinary tract, which includes the kidneys, ureters, bladder, and urethra. UTIs are most common in the bladder (cystitis) and urethra (urethritis). UTIs are caused by bacteria, such as Escherichia coli (E. coli). Bacteria can enter the urinary tract through the urethra and travel up to the bladder. Once in the bladder, the bacteria can multiply and cause an infection. UTIs are more common in women than in men. This is because the female urethra is shorter than the male urethra, making it easier for bacteria to enter the bladder. UTIs are also more common in people with diabetes, pregnant women, and people who use catheters. UTI symptoms The most common UTI symptoms include: Pain or burning when urinating (dysuria) Frequent urination, especially at night (nocturia) Urgent need to urinate Cloudy or foul-smelling urine Blood in the urine (hematuria) Pelvic pain...
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