What causes a bladder infection?

What causes a bladder infection?

A bladder infection is usually caused by bacteria entering the urethra and multiplying in your bladder. The most common type of bacteria is Escherichia coli (E. coli).

There are factors that increase the risk of bladder infections. These include:

• Anatomical abnormalities of the urinary tract.
• Menopause.
• Using a catheter.
• Using spermicides.
• Constipation.
• Multiple sexual partners.