UTI Symptoms in Men: Why Testing Matters

Are UTIs in men different from UTIs in women?

Yes, in important ways. Urinary tract infections are far more common in women, largely because the female urethra is much shorter, so bacteria have a shorter distance to travel to the bladder. In a healthy, nonpregnant woman with classic symptoms, acute uncomplicated cystitis is often diagnosed from the history and a urinalysis alone, and a urine culture is not always needed.^[3]

In men, the picture is different. A UTI in a man has traditionally been classified as a complicated infection, meaning it is assumed to involve a structural, functional, or prostate-related factor until proven otherwise. That classification drives two practical differences: men are more likely to need a urine culture, and they are more likely to need an assessment for an enlarged prostate, a stricture, a stone, or another anatomic problem.^[1][4][5]

There is a recent, important update. The 2025 IDSA guideline now defines uncomplicated UTI as infection limited to the bladder in both women and men, and it allows shorter antibiotic courses for men whose infection stays in the bladder without fever or signs of prostate involvement. Even so, the same guideline keeps a longer course, 10 to 14 days, for men with a febrile UTI in whom acute bacterial prostatitis is suspected.^[2][8]

What causes UTIs in men?

Most male urinary tract infections are caused by the same bacteria that cause UTIs in women, with Escherichia coli (E. coli) the most common organism by a wide margin. In a systematic review of acute cystitis in men, E. coli accounted for roughly one-third to more than 90 percent of infections depending on the study.^[7]

What sets male UTIs apart is the underlying anatomy. Because a man's urethra is long and the prostate sits around it, a simple bladder infection is less likely to happen by chance. When a UTI does occur, clinicians look for a reason: an enlarged prostate that does not empty the bladder completely, a urethral stricture, a bladder or kidney stone, recent catheter use or urinary instrumentation, or a prior procedure.^[5][6]

Benign prostatic hyperplasia (BPH), a noncancerous enlargement of the prostate, is the leading underlying cause of urinary tract infection in men over age 50. An enlarged prostate can leave urine behind in the bladder after voiding, and that residual urine gives bacteria a place to grow. This is why a man with a first UTI is often assessed for lower urinary tract symptoms such as a weak stream, straining, or a feeling of incomplete emptying.^[6]

Can a UTI in men be a sign of something else (prostatitis, urethritis, STI)?

Yes, and this is a central reason male urinary symptoms should be evaluated rather than self-treated. Several conditions produce symptoms that overlap with a bladder infection, and each is managed differently.

Prostatitis. Acute bacterial prostatitis is an infection of the prostate gland. It can cause burning with urination and frequency, but it typically adds fever, chills, pain in the lower back or between the scrotum and rectum, and sometimes difficulty urinating. On examination the prostate is often tender. Because the prostate is poorly penetrated by some antibiotics, acute bacterial prostatitis is treated longer, and the 2025 IDSA guideline recommends 10 to 14 days for men with a febrile UTI in whom prostatitis is suspected.^[2][5]

Urethritis and sexually transmitted infections. Chlamydia and gonorrhea can infect the urethra and cause burning with urination and a discharge. These are not bladder infections, and they are treated with different antibiotics. CDC guidance recommends testing men with urethral symptoms for Chlamydia trachomatis and Neisseria gonorrhoeae and treating accordingly.^[10]

Structural problems. A stone, stricture, or obstruction can cause pain, frequency, and blood in the urine without an infection. These are identified with imaging or cystoscopy when the history points that way.^[6]

Asymptomatic bacteriuria. Older men can have bacteria in the urine without symptoms. This is not a UTI and generally should not be treated with antibiotics, because treatment provides no benefit and can cause harm.^[9]

How is a UTI diagnosed in men?

Diagnosis starts with the story and the urine. A clinician asks about burning, frequency, urgency, blood in the urine, fever, and any discharge, and about prior infections, prostate symptoms, recent procedures, and sexual history. A physical exam may include checking the abdomen and, when prostate disease is possible, a digital rectal examination to feel the prostate for tenderness or enlargement.^[6]

The urine is tested in two steps. A urinalysis looks for white blood cells, nitrites, and blood, and it can be done quickly. A urine culture is the step that grows and identifies the specific bacteria and reports which antibiotics will work. For men, the culture is the more important test because it confirms the organism and directs treatment.^[4]

After a first UTI in a man, a structured workup is often recommended to look for an underlying cause. A 2026 review describes first-line assessment as a targeted history, a digital rectal exam, a symptom score for prostate symptoms, and an ultrasound of the urinary tract with a measurement of how much urine remains after voiding. That post-void residual measurement is a direct check for incomplete bladder emptying, the most common mechanical reason a man gets a UTI.^[6]

Why do men usually need a urine culture?

The short answer is that a male UTI is more likely to be complicated, and complicated infections are exactly the situation where a culture earns its keep. In a widely cited review of laboratory diagnosis, urine culture is described as unnecessary for straightforward outpatient cystitis but necessary for patients with recurrent infection, treatment failure, or complicated infection.^[4]

A culture does three things a dipstick cannot. It identifies the exact organism, it reports antibiotic susceptibility so treatment can be matched to the bacteria rather than guessed, and it helps detect resistance, which is more common in men who have been treated before or who have structural problems.^[4][7]

There is also a practical reason. Because a male UTI can be caused by a prostate infection, a stone, or a stricture, the culture result helps the clinician decide whether the infection is confined to the bladder or whether a longer course or a urology referral is needed.^[6]

What is the treatment for a UTI in men?

Treatment is an antibiotic matched to the organism and the setting. The 2025 IDSA guideline recommends that patients with a complicated UTI who are improving can be treated with a shorter course, 5 to 7 days of a fluoroquinolone or 7 days of a non-fluoroquinolone antibiotic, rather than a longer course. The same guideline makes an important exception: men with a febrile UTI in whom acute bacterial prostatitis is suspected may benefit from 10 to 14 days, because the prostate is harder for antibiotics to reach.^[2]

For a bladder-limited infection without fever or prostate involvement, shorter courses are increasingly supported. A large 2026 study of male outpatients found that beta-lactam and nitrofurantoin prescriptions were associated with modestly more return visits than fluoroquinolones, while trimethoprim-sulfamethoxazole performed similarly to fluoroquinolones. The takeaway is that the choice and duration depend on the individual, the culture result, and whether the prostate is involved.^[8]

Fluoroquinolones such as ciprofloxacin have historically been preferred for suspected prostate infection because they penetrate prostate tissue well, but they carry risks including tendon injury and are reserved for situations where they are clearly needed.^[2]

Finish the prescribed course and follow up if symptoms do not improve. A man whose symptoms persist or recur after treatment needs reassessment, often with a repeat culture and a check for an underlying structural problem.^[4][6]

When should a man get urgent care for urinary symptoms?

Most lower urinary symptoms can be evaluated the same day through a routine visit, but several findings should prompt urgent or emergency care rather than waiting. Fever with chills, pain in the flank or lower back, nausea or vomiting, or feeling systemically unwell can signal that an infection has moved beyond the bladder to the kidneys or prostate.^[2][6]

Inability to urinate, or passing only small amounts while feeling a full bladder, is a separate emergency called urinary retention and needs prompt attention. Severe pain, visible blood in the urine, or confusion in an older man also lower the threshold for urgent evaluation.^[6]

A 2026 review also lists the findings that warrant a urology referral after a first UTI: pyelonephritis, urinary retention, visible blood in the urine, a prostate symptom score above 7, a post-void residual above 100 milliliters, recurrent infection, age under 40, or an abnormality on imaging. These are the situations where a structural cause is most likely and a specialist evaluation adds the most value.^[6]

How can men reduce the risk of UTIs?

Prevention in men centers on the underlying cause rather than general habits alone. The single most important step is treating the reason urine is not clearing normally, most often an enlarged prostate. Managing BPH, whether with medication or a procedure, reduces the residual urine that lets bacteria grow.^[6]

Practical habits still help. Drinking enough fluid to keep urine flowing, urinating when the need arises rather than holding it, and emptying the bladder completely can reduce the chance bacteria linger. For men who use catheters, following sterile technique and changing catheters on schedule lowers infection risk.^[5]

There is less high-quality evidence for specific supplements or dietary measures in men than in women, so these should not replace treating an identified structural or prostate problem. A man with recurrent UTIs should be evaluated for an underlying cause and a prevention plan rather than repeatedly treating each episode in isolation.^[6]