Generally, bladder infections are classified as urinary tract infections (UTIs), which emerge anywhere in the urinary tract, such as the kidneys, bladder, ureters, and urethra. Lower tract UTIs are more common since bacteria can enter more easily.

It is common for bladder infections to be caused by Escherichia coli (E. coli), which is found naturally in the large intestine. Various symptoms can indicate a bladder infection, but you may not notice changes during urination. Some of the most common symptoms include: