Urinary tract infections in men are less common than in women, but they tend to be more serious when they happen. The reason comes down to anatomy. A man’s urethra is longer, which makes it harder for bacteria to reach the bladder. When an infection does take hold in a man, it often signals something else going on, like a blocked urinary path or an enlarged prostate. That is why male UTIs are treated differently and taken more seriously.
How Does a Guy Get a UTI?
A UTI happens when bacteria get into the urinary tract and multiply. In men, the most common culprit is E. coli, a bacterium that normally lives in the gut. It can travel from the skin around the anus to the opening of the urethra and move upward.
For a woman, that trip is short. The female urethra is about 1.5 inches long. The male urethra runs roughly 8 inches from the bladder to the tip of the penis. That length is a real barrier. It is the main reason men get far fewer UTIs than women.
But length is not a perfect shield. When bacteria get past it, they can set up in the urethra, the bladder, or the prostate. In men, the prostate sits right below the bladder and the urethra passes through it. That gland becomes a common site for infection because bacteria can settle there and be harder to clear.
Some men get UTIs without any obvious trigger. Others have a specific reason the normal defenses broke down. The sections below cover those reasons.
What Causes a UTI in Men?
The causes fall into a few clear groups. Knowing which one applies to you matters, because it changes the treatment.
Blocked urine flow. When urine cannot drain freely, bacteria that enter the tract are not flushed out. An enlarged prostate is the most common cause of this in older men. Prostate enlargement is extremely common with age and often narrows the urethra. Kidney stones and tumors can also block the flow.
Catheters and medical procedures. Any tube placed into the bladder gives bacteria a direct route in. Men with a urinary catheter have a higher risk of infection. The longer a catheter stays in, the higher that risk climbs.
Not emptying the bladder fully. If the bladder never fully empties, a small pool of urine stays behind. That standing urine is a place for bacteria to grow. This is common with prostate enlargement and with nerve conditions that affect bladder control.
Sexual activity. Pressure during sex can push bacteria into the urethra. This is a well-known trigger in women and it applies to men too, especially men who have sex with men, where anal bacteria can reach the urethra more easily.
Diabetes and a weakened immune system. High blood sugar and a suppressed immune system make it harder for the body to fight off bacteria that reach the tract.
Poor hygiene or an uncircumcised penis. Bacteria can collect under the foreskin. Men who are uncircumcised have a somewhat higher risk, though this is a small factor compared with anatomy and urine flow.
In younger men, a UTI often points to a structural problem or a sexually transmitted infection. In older men, it more often points to the prostate or a catheter. The pattern shifts with age, and that shift is useful for doctors trying to find the root cause.
What Are the Symptoms of a UTI in Men?
The symptoms depend on which part of the tract is infected. A bladder infection feels different from a kidney infection, and a prostate infection feels different from both.
- A burning feeling when urinating
- A frequent, urgent need to urinate, often with little coming out
- Cloudy, dark, or foul-smelling urine
- Pain in the lower belly or pelvis
- Pain in the perineum, the area between the scrotum and the anus, which points toward the prostate
- Blood in the urine
- Fever, chills, and feeling generally unwell
Fever and chills are a warning sign. They usually mean the infection has moved beyond the bladder, into the kidney or the prostate. That is a more serious situation and needs prompt medical care.
Older men can be tricky here. A UTI in an older man may show up as confusion or sudden weakness rather than the classic burning. This is a well-recognized pattern and one reason UTIs in older adults can be missed.
When Is a UTI in Men Dangerous?
A bladder infection alone is uncomfortable but usually treatable. The danger comes when the infection spreads upward or settles deep in tissue.
Kidney infection. When bacteria climb from the bladder to a kidney, it is called pyelonephritis. This causes high fever, chills, back or side pain, and nausea. It can scar the kidney and, in serious cases, lead to a bloodstream infection. This is a medical emergency and needs treatment right away.
Prostate infection. Acute bacterial prostatitis causes fever, pelvic pain, and trouble urinating. It can be severe and requires a longer course of antibiotics than a simple bladder infection.
Sepsis. If bacteria enter the bloodstream, the body can mount an overwhelming response. This is life-threatening and requires hospital care.
Men are more likely than women to have their infection reach these deeper stages. The longer urethra means bacteria that do get in have often come from a source that will keep feeding the infection, like a blocked prostate. That is why a man with UTI symptoms should not wait to see if it clears on its own.
How Is a UTI in Men Treated?
Antibiotics are the core treatment. The choice and the length of the course depend on how serious the infection is and where it sits.
A simple bladder infection in a man is typically treated with a short course of antibiotics. Some clinicians use a shorter course, while others treat men longer than women because of the higher risk of the infection moving into the prostate. The right length is a judgment your doctor makes based on your specific case.
A kidney or prostate infection needs a longer course, sometimes given through an IV in the hospital. If a blockage is the root cause, antibiotics alone may not be enough. The blockage has to be relieved for the infection to clear.
A few points that matter:
- Finish the full course of antibiotics even if you feel better in a day or two.
- Do not use leftover antibiotics from a past illness. The drug may not match the bacteria.
- Drink water to help flush the tract, unless your doctor tells you to limit fluids for another reason.
- Do not delay care if you have fever, chills, or back pain.
Some clinicians recommend a urine test before treatment to confirm the infection and identify the bacteria. This is more common in men than in women because male UTIs are more often linked to a resistant organism or a structural cause. Whether your doctor tests first depends on your symptoms and history.
Can You Prevent a UTI as a Man?
There is no guaranteed way to prevent every UTI. But some steps reduce the odds, especially if you have a known risk factor.
- Drink enough water so your urine stays light in color. This helps flush bacteria out.
- Urinate when you feel the need. Do not hold it for long stretches.
- Urinate after sex to help clear bacteria from the urethra.
- Keep the genital area clean and dry. If you are uncircumcised, wash under the foreskin.
- Manage diabetes well, since high blood sugar raises infection risk.
- If you use a catheter, follow your care team’s instructions on keeping it clean and changing it on schedule.
If you get repeated UTIs, that is a signal worth taking seriously. Recurrent infections in men often point to an underlying problem, such as an enlarged prostate, a stone, or a structural issue. Finding and treating that cause is often the only way to stop the cycle.
One thing that does not help: cranberry products. The evidence on cranberry for preventing UTIs is mixed at best, and no large human trial has confirmed it prevents infections in men. It is not a substitute for treating an active infection.
Frequently Asked Questions
Can a man get a UTI from sex?
Yes, sexual activity can push bacteria into the urethra and trigger an infection. This risk is higher for men who have anal sex, since gut bacteria can reach the urethra more easily.
How do I know if my UTI has spread to my kidney?
Fever, chills, and pain in your back or side are the main signs that the infection has moved beyond the bladder. These symptoms mean you should seek medical care right away.
Do men need a longer course of antibiotics than women for a UTI?
Often yes, because male UTIs carry a higher risk of involving the prostate, which is harder to clear. The exact length is a decision your doctor makes based on how serious your infection is.
Can a UTI go away on its own in men?
It is not safe to assume it will, because male UTIs are more likely to spread to the kidney or prostate. See a doctor rather than waiting to see if symptoms clear.

