Medication can often treat urethritis quickly. If the infection goes untreated, however, the effects can be lasting and quite serious. For example, the infection may spread to other parts of the urinary tract, including the ureters, kidneys, and bladder. These infections can be painful on their own. While they can be treated with more intensive rounds of antibiotics, they can cause damage to the organs if left untreated for too long. These untreated infections can also spread to the blood and result in sepsis, which can be deadly.
In addition, the STIs that frequently cause urethritis can damage the reproductive system. Women may develop pelvic inflammatory disease (PID), which is painful and can result in infertility, ongoing pelvic pain, or pain during sex. Women with untreated STIs are also at a higher risk for ectopic pregnancies, which can be life-threatening.
Men may develop painful inflammation or infection of the prostate gland, or the narrowing of a section of the urethra due to scarring, leading to painful urination. For these reasons, you should speak with a doctor as soon as possible if you notice any symptoms of urethritis.