What are the different types of urinary tract infections?

A urinary tract infection may involve different sections of the urinary tract including the following:

Urethritis-an infection of the urethra, the hollow tube that drains urine from the bladder to the outside of the body.



Cystitis-a bacterial infection in the bladder that often has moved up from the urethra.



Pyelonephritis-an infection of the kidneys that is usually a result of an infection that has spread up the tract, or from an obstruction in the 
  urinary tract. An obstruction in the urinary tract causes urine to back flow into the ureters and kidneys.


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