A urinary tract infection (UTI) in men is a bacterial infection anywhere along the urinary system, including the urethra, bladder, or kidneys. While far less common in men than women, UTIs in men are treated more aggressively because they carry a higher risk of complications. The incidence in adult men under 50 is low, roughly 5 to 8 cases per 10,000 each year, but the risk climbs significantly with age, particularly after the prostate begins to enlarge.
Why UTIs Are Less Common in Men
Men have a much longer urethra than women, which means bacteria have a longer path to travel before reaching the bladder. This anatomical advantage keeps UTI rates extremely low in young men, with a prevalence of bacteria in the urine of 0.1% or less. In fact, the only age when boys are more prone to UTIs than girls is during the first three months of life, when the male-to-female ratio is about 1.5 to 1. After infancy, men rarely develop UTIs until middle age or later, when prostate changes and other risk factors start to shift the balance.
What Causes UTIs in Men
Because UTIs are uncommon in younger men, doctors typically look for an underlying cause when one occurs. The most frequent culprit in older men is an enlarged prostate. The prostate sits just below the bladder, and the urethra runs directly through it. As the prostate grows, it squeezes the urethra and restricts urine flow. That incomplete emptying leaves urine sitting in the bladder, creating a warm, stagnant environment where bacteria thrive.
Urinary catheters are another major risk factor. About 75% of UTIs acquired in hospitals are associated with catheter use, and the single biggest driver of risk is how long the catheter stays in place. Between 15% and 25% of hospitalized patients have a catheter at any given time, making this a common source of infection for men recovering from surgery or managing other conditions.
Other factors that increase risk include kidney stones, diabetes, a weakened immune system, and any structural abnormality in the urinary tract that prevents normal urine flow.
Symptoms to Recognize
The symptoms of a UTI depend on where the infection has settled. A bladder infection (the most common type) typically causes a burning sensation during urination, a persistent urge to urinate even when little comes out, pelvic pressure or discomfort in the lower belly, and sometimes visible blood in the urine that looks pink, red, or cola-colored. Men may also notice urethral discharge, which is more specific to infections in the urethra itself.
When infection reaches the kidneys, the symptoms escalate. Back or side pain, high fever, shaking chills, nausea, and vomiting all signal that the infection has moved beyond the bladder. This is a more serious situation that requires prompt treatment.
How Doctors Diagnose a Male UTI
A urine culture is the standard diagnostic step for men with UTI symptoms. Unlike in women, where a simple urine dipstick test is often enough, guidelines recommend a full culture and sensitivity test for men. This identifies the specific bacteria involved and which antibiotics will work against them. A count of more than 100,000 bacterial colonies per milliliter on a urine culture is generally considered diagnostic.
If UTIs recur, your doctor may order imaging or other tests to look for structural problems like an enlarged prostate, kidney stones, or narrowing of the urethra. Repeated infections can scar the urethra over time, making it progressively harder to pass urine and creating a cycle of obstruction and reinfection.
Treatment Takes Longer Than in Women
Men with an uncomplicated bladder infection are typically prescribed a 7-day course of antibiotics, compared to the 3-day course that’s standard for most women. The longer treatment reflects the higher complication risk in men and the possibility that bacteria have reached the prostate, which is harder for antibiotics to penetrate. Completing the full course matters, even if symptoms improve within a day or two.
If the infection has spread to the kidneys or prostate, treatment may extend further, and some men need intravenous antibiotics initially before switching to oral medication. Your doctor will choose the specific antibiotic based on the results of your urine culture.
When a UTI Leads to Prostatitis
One of the complications unique to men is bacterial prostatitis, an infection of the prostate gland itself. Men with lower UTIs are more likely to develop this condition, and UTIs that recur or prove difficult to treat can lead to a chronic form that lasts three months or longer.
Acute bacterial prostatitis comes on suddenly and hits hard. Symptoms include fever and chills, severe pain in the groin, lower abdomen, or lower back, difficulty starting a urine stream, a weak or interrupted flow, and sometimes a complete inability to urinate. Nausea, vomiting, and body aches are common. This is a condition that requires immediate medical attention.
Chronic bacterial prostatitis presents similarly but less severely. The symptoms tend to wax and wane over months: urinary urgency, burning during urination, pelvic pain, and painful ejaculation. It often develops after a previous UTI or acute prostatitis episode and can be frustrating to treat because antibiotics have difficulty reaching effective concentrations inside prostate tissue.
Warning Signs of a Serious Complication
A UTI that enters the bloodstream can trigger urosepsis, a life-threatening emergency. The risk is highest when infection reaches the kidneys. Warning signs that a UTI has progressed to this stage include a rapid heart rate, breathing faster than normal, difficulty breathing, fever with chills, an inability to urinate, and a general sense of being severely unwell. These symptoms require emergency care. Sepsis progresses quickly, and early treatment dramatically improves outcomes.
Reducing Your Risk
Staying well hydrated is the simplest and most effective prevention strategy. Adequate fluid intake keeps urine flowing regularly, flushing bacteria out before they can establish an infection. Urinating after sexual activity helps clear any bacteria that may have entered the urethra. Showers are preferable to baths, and avoiding sprays or powders in the genital area reduces irritation that can make infection more likely.
For men with an enlarged prostate, managing that condition directly reduces UTI risk. If you’re consistently unable to fully empty your bladder, addressing the obstruction (whether through medication or a procedure) removes the underlying cause rather than just treating infections as they arise. Men who need a catheter should have it removed as soon as medically possible, since duration of use is the single strongest predictor of catheter-associated infection.