Urinary tract infections are caused by bacteria like E. coli entering the urinary tract. Women are more prone to UTIs, which can affect the urethra, bladder, ureters or kidneys. Common symptoms include urgency, frequent urination and abdominal or back pain. Diagnosis involves testing a urine sample for bacteria and white blood cells. Left untreated, UTIs during pregnancy can travel to the kidneys due to hormonal changes. Proper treatment uses antibiotics to resolve the infection.