1. Symptoms from a lower urinary tract include pain with urination, frequent urination, and feeling the need to urinate despite having an empty bladder.
2. When it affects the lower urinary tract it is known as a bladder infection (cystitis) and when it affects the upper urinary tract it is known as kidney infection (pyelonephritis).
3. Symptoms of a kidney infection include fever and flank pain usually in addition to the symptoms of a lower UTI.
4. A urinary tract infection (UTI) is an infection that affects part of the urinary tract.
5. Rarely the urine may appear bloody.
6. In the very old and the very young, symptoms may be vague or non-specific.