When treated promptly and properly, lower urinary tract infections rarely lead to complications. But left untreated, UTIs can cause serious health problems.
Complications of a UTI may include:
Repeated infections, which means you have two or more UTIs within six months or three or more within a year. Women are especially prone to having repeated infections.
Permanent kidney damage from a kidney infection due to an untreated UTI
A narrowed urethra in men from having repeated infections of the urethra.
Sepsis, a potentially life-threatening complication of an infection. This is a risk especially if the infection travels up the urinary tract to the kidneys.