Urinary Tract Infections are common infections occurring when bacteria typically get into the urethra via the skin or rectum and infect the urinary system. Either the urethra, ureters, bladder and kidneys can affect all parts of the urinary system. Symptoms generally include urination, urination, and discomfort in your side or lower back. symptoms include urination. Usually, Urinary tract infections may be antibiotically treated.