An infection in any component of the urinary system, such as the nephrons, bladder, ureters, or urethra, is called a urinary tract infection (UTI). Bacteria like E. coli cause most UTIs, and antibiotics can be used to treat them. Some people may wonder if a UTI can heal without treatment. But, most of the time, you shouldn't let a UTI go untreated. UTIs can cause various symptoms, such as the need to go to ...