Urinary tract infections often create pain and feelings of discomfort, such as urgency and frequency to urinate. Conditions involving the urinary tract include infection of the kidney, bladder and urethra, while inflammation of the bladder is the most common. If the bacteria spread to the kidney, the affected person develops symptoms that include a fever, pain in the back or side below the ribs, nausea, or vomiting. Kidney infections need to be treated quickly, are more serious than bladder infections, and less common. Women are affected by urinary tract infections more than men. The condition is treatable and typically resolves very quickly.