How does acute cystitis affect the lining of the urinary bladder?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

The most common cause of urinary tract infection is invasion into the urethra of Escherichia coli, a type of bacterium that normally inhabits the bowel. — urinary tract infection The most common cause of urinary tract infection is invasion into the urethra of *Escherichia coli*, a type of bacterium that normally inhabits the bowel.

In cases of acute cystitis, the mucous membrane lining the urinary bladder undergoes significant pathological changes due to bacterial infection. The lining becomes red and swollen, and it may begin to bleed.1

As the condition progresses, the following structural changes can occur to the bladder lining:

Ulceration: Small ulcers may develop on the surface.1
Tissue Shedding: The surface layer of the lining may shred.1
Cyst Formation: Small, clear cysts containing liquid, gas, or semisolid material frequently form.1
Abscesses: In some instances, abscesses may develop within the tissue.1

These inflammatory responses are typically associated with urinary tract infections and often result in symptoms such as burning pain during urination and increased urinary urgency.1