Blood in a man’s urine, called hematuria, can signal anything from a minor infection to a more serious condition like bladder cancer. It is never normal and always worth getting checked, even if it only happens once. The blood may be visible, turning urine pink, red, or brown, or it may be invisible to the naked eye and only detected during a routine urine test.
Visible vs. Invisible Blood
There are two types. Gross hematuria is blood you can actually see. Your urine looks pink, red, or cola-colored. It takes a surprisingly small amount of blood to change the color, so even a dramatic-looking episode doesn’t necessarily mean massive bleeding. Microscopic hematuria, on the other hand, produces no color change at all. It’s defined as more than 3 red blood cells per high-power field on a lab slide and is typically caught during a urinalysis for something else entirely.
Both types deserve the same follow-up. Microscopic hematuria that’s discovered incidentally is sometimes the earliest sign of a condition that hasn’t caused symptoms yet.
Common Causes in Men
Several conditions can put blood into the urinary tract, and each tends to come with its own pattern of symptoms.
Urinary tract infections. UTIs are less common in men than women but do happen, especially in older men. Along with bloody urine, you’ll typically notice a persistent, urgent need to urinate, burning or pain during urination, and strong-smelling urine.
Kidney or bladder stones. Minerals can crystallize inside the kidneys or bladder and form stones. These are often painless while they sit in place, but they can cause severe, sharp pain when they shift, block urine flow, or pass through the urinary tract. Stones scratch the lining of the ureter or bladder on their way out, producing blood.
Enlarged prostate. Benign prostatic hyperplasia (BPH) is extremely common in men over 50. As the prostate grows, it can compress the urethra and irritate surrounding tissue enough to cause bleeding. You may also notice a weak urine stream, difficulty starting urination, or the feeling that your bladder never fully empties.
Prostatitis. An inflamed or infected prostate can produce blood in the urine along with pelvic pain, painful urination, and sometimes pain during ejaculation. It can be caused by bacteria or, in many cases, have no identifiable infectious cause.
Vigorous exercise. Intense physical activity, particularly long-distance running, can trigger hematuria through a combination of dehydration, reduced blood flow to the kidneys, and direct bladder trauma from repeated impact. In endurance athletes, this type of bleeding is typically self-limiting and resolves within 48 to 72 hours. If it doesn’t clear up in that window, something else is going on.
When Blood May Signal Cancer
Painless gross hematuria is one of the hallmark warning signs of bladder cancer, the most common urinary tract cancer in men. Kidney cancer and cancers of the ureter can also present this way. The key word is painless: blood that shows up without burning, urgency, or any other obvious explanation is the scenario that raises the most concern.
Male sex and a history of smoking are two of the strongest risk factors for bladder cancer being the cause of hematuria. Age matters too. The older you are, the more carefully blood in the urine is investigated. This doesn’t mean every episode of bloody urine is cancer. Most of the time it isn’t. But the possibility is exactly why no episode should be ignored, especially if you’re over 40, smoke or used to smoke, or have had exposure to industrial chemicals or dyes.
Things That Mimic Blood in Urine
Before assuming the worst, it’s worth knowing that several foods, supplements, and medications can turn urine red or pink without any blood being present. Beets are the most common culprit (sometimes called “beeturia”), along with blackberries and rhubarb. On the medication side, rifampin (a tuberculosis drug), phenazopyridine (a bladder pain reliever), senna-based laxatives, ibuprofen, iron pills, and certain forms of vitamin B12 can all change urine color. Red food dyes like Red Dye 40 can do it too.
A simple urinalysis will confirm whether actual red blood cells are present or if it’s just a color change. That test is the first step in sorting things out.
How the Cause Is Found
The workup starts with a urine test and a conversation about your medical history, medications, smoking habits, and symptoms. A blood test to check kidney function is standard. From there, the approach depends on how likely a serious cause seems.
If your risk for cancer or other significant disease is low, you may simply repeat the urinalysis in six months to see if the blood is still there. For intermediate risk, an ultrasound of the kidneys and a cystoscopy (a thin camera inserted through the urethra to look inside the bladder) are typically recommended. For higher-risk situations, a CT urography replaces the ultrasound. This specialized CT scan images the kidneys, ureters, and bladder in multiple phases and is highly sensitive for detecting small tumors and stones. If you can’t have contrast dye for a CT, an MRI-based version or other imaging combinations can substitute.
Cystoscopy plays a central role because no imaging technique can fully rule out disease inside the bladder and lower urinary tract. The procedure is done with a flexible scope, usually in an office setting, and takes only a few minutes. It’s uncomfortable but generally tolerable.
What Makes Your Risk Higher or Lower
Current guidelines from the American Urological Association sort men with microscopic hematuria into risk categories. The factors that push you toward the higher-risk end include:
- Age over 40
- Smoking history, including past smoking
- Gross hematuria, even a single episode
- Persistent microscopic hematuria on repeat testing
- Occupational exposure to chemicals or dyes
If you’re younger, have never smoked, and the blood is only microscopic, you’re more likely in the low-risk category where monitoring alone is appropriate. But the categorization is something your doctor determines after reviewing the full picture.
What to Pay Attention To
A single episode of pink-tinged urine after a hard workout that clears within a day or two is the least worrying scenario. On the other end, blood that appears without pain, returns repeatedly, or comes with clots is the combination that warrants the most urgent evaluation. Difficulty urinating or being unable to urinate at all alongside bloody urine needs same-day attention. Unexplained weight loss, persistent back or flank pain, or fevers alongside hematuria also shift the urgency higher.
Even when the cause turns out to be something benign, like a stone or an enlarged prostate, knowing the answer lets you get the right treatment and stop worrying about the alternatives.