Seeing blood in your urine is alarming. Seeing actual blood clots when you pee is even more concerning. It means there is bleeding somewhere in your urinary tract that is significant enough to form clots. This is not normal and always requires a medical evaluation. The causes range from a simple urinary tract infection to kidney stones or more serious conditions like prostate issues or bladder cancer. You need to see a doctor promptly to find out what is happening.
What Causes Blood Clots in Urine in Men?
Blood clots in urine mean the bleeding is coming from somewhere above the urethra. The blood has had time to clot before it leaves the body. The most common cause in men is a problem in the prostate gland. The prostate sits right below the bladder and surrounds the urethra. When it becomes enlarged or infected, blood vessels can break and bleed.
Kidney stones are another frequent cause. A stone moving through the ureter can scrape the lining and cause bleeding. If the bleeding is heavy enough, clots can form. Urinary tract infections can also cause this, especially if the infection is severe and inflames the bladder lining. Less common but more serious causes include bladder or kidney cancer, trauma to the kidney area, or bleeding disorders.
Research published in the journal Urology found that in men over 40 with visible blood in urine, about 20% had a significant underlying condition that needed treatment. This is not something to wait and see about.
Is Blood in Urine Always an Emergency?
Not every case requires a trip to the emergency room, but it does require prompt medical attention. If you pass blood clots and have no pain, you still need to see a urologist within a few days. If you have blood clots along with severe pain, fever, chills, or cannot urinate at all, that is an emergency.
The color of the blood gives some clues. Bright red blood usually means the bleeding is coming from the lower urinary tract — the bladder or prostate. Dark red or brown blood means the blood is older and likely coming from the kidneys. But color alone does not tell you the cause. Only testing can do that.
The American Urological Association recommends that any man over 35 with visible blood in urine see a urologist for a full workup. This includes a urine test, imaging, and often a scope of the bladder called a cystoscopy.
What Does the Doctor Do to Find the Cause?
Your doctor will start with a urinalysis. This checks for infection, blood cells, and abnormal cells. A urine culture can confirm if bacteria are present. Next is imaging. A CT scan is the most common test because it gives a clear picture of the kidneys, ureters, and bladder. It can find stones, tumors, or structural problems.
A cystoscopy is the gold standard for seeing inside the bladder. The doctor inserts a thin camera through the urethra and looks at the bladder lining. This can find small tumors or areas of inflammation that imaging might miss. Blood work checks kidney function and rules out bleeding disorders. In men, a prostate exam is also standard to check for enlargement or nodules that could indicate cancer.
One study from the Journal of Urology found that CT scans and cystoscopy together find the cause of blood in urine in over 90% of cases. The process is straightforward, and the tests are not as uncomfortable as most men fear.
Can Medications or Supplements Cause Blood Clots in Urine?
Yes, some medications can cause bleeding in the urinary tract. Blood thinners like warfarin, apixaban, or rivaroxaban are the most common culprits. These drugs prevent clotting throughout the body. If you have a small bleed from a kidney stone or infection, the blood thinner can make it much worse and cause visible clots.
Nonsteroidal anti-inflammatory drugs like ibuprofen and naproxen can also cause bleeding if taken in high doses or for long periods. They affect the kidneys’ ability to protect their lining. Some herbal supplements, particularly those that affect bleeding like ginkgo biloba or high-dose fish oil, may contribute as well.
If you take any of these, do not stop them on your own. Talk to your doctor. They need to know everything you take — prescription, over-the-counter, and supplements — to figure out what is causing the bleeding.
| Potential Cause | Key Signs | Typical Next Step |
|---|---|---|
| Prostate enlargement (BPH) | Slow stream, frequent urination, straining | Prostate exam, urine flow test |
| Kidney stone | Sharp pain in back or side, nausea | CT scan, stone analysis |
| Urinary tract infection | Burning with urination, cloudy urine, fever | Urine culture, antibiotics |
| Bladder cancer | Painless blood in urine, no other symptoms | Cystoscopy, biopsy |
| Blood thinner medication | Known use of anticoagulant, easy bruising | Medication review, dose adjustment |
What Should You Do While Waiting for Your Appointment?
While you wait to see a doctor, drink plenty of water. Staying hydrated keeps urine flowing and can help flush small clots and bacteria. Do not stop drinking fluids thinking it will make the bleeding stop. That can actually make things worse.
Avoid vigorous exercise or heavy lifting until you know the cause. Physical activity can raise blood pressure and increase bleeding. Also avoid alcohol and caffeine, which can irritate the bladder and dehydrate you. Do not take any new medications or supplements without checking with your doctor first.
Keep track of what you see. Note when the blood appears, how much there is, and whether it comes and goes. Write down any pain or other symptoms. This information helps your doctor narrow down the cause faster.
Common Misconceptions About Blood Clots in Urine
Some people believe that blood in urine always means cancer. That is not true. Most causes of blood in urine are not cancer. Infections, stones, and prostate issues are far more common. But cancer is one possible cause, which is why you need to be checked.
Another myth is that if the blood goes away on its own, the problem is gone. This is dangerous. Bleeding can stop and start. A tumor or stone can bleed intermittently. The absence of blood for a few days does not mean the underlying cause has resolved. You still need a full evaluation.
Some men think they caused the bleeding by something they did, like lifting something heavy or having sex. While trauma can cause bleeding, most cases have nothing to do with an event you can remember. Do not blame yourself. Focus on getting the right tests.
- Blood in urine does not automatically mean cancer
- Bleeding that stops on its own does not mean the problem is gone
- Most causes are treatable when caught early
- You cannot diagnose yourself based on symptoms alone
What Happens If You Ignore Blood Clots in Urine?
Ignoring blood clots in urine carries real risks. If the cause is an infection, it can spread to the kidneys or bloodstream. A kidney infection can cause permanent damage and become life-threatening if not treated. Kidney stones that are bleeding may also be blocking urine flow, which can damage the kidney over time.
If the cause is a tumor, waiting gives it time to grow and spread. Bladder cancer caught early has a five-year survival rate over 90%. Caught late, that number drops significantly. The same is true for kidney cancer. The window for the best outcome is narrow.
Delaying care also means living with uncertainty. That anxiety affects sleep, mood, and quality of life. Getting a diagnosis, even if it is not what you hoped for, is better than not knowing. Most men who get checked find that the cause is treatable and not life-threatening.
Frequently Asked Questions
Can a man pass blood clots from a urinary tract infection?
Yes, a severe UTI can cause enough inflammation and bleeding to form clots. This is more common in men with an enlarged prostate that traps bacteria.
Is it normal to pass blood clots after a prostate biopsy?
Some bleeding is expected for a few days after a biopsy. Large clots or bleeding that lasts longer than a week should be reported to your doctor.
Does dehydration cause blood clots in urine?
Dehydration alone does not cause bleeding. It can make existing urine more concentrated, which makes blood more visible, but the underlying cause is something else.
Can a kidney stone cause blood clots without pain?
Yes, some kidney stones cause bleeding without the classic sharp pain. The stone may be stationary but still irritating the tissue enough to bleed.

