Blood Clots in Urine: What Patients Need to Know

Blood clots in urine usually mean there is enough bleeding in the urinary tract for blood to thicken and form visible clumps. This can happen with infections, stones, an enlarged prostate, kidney disease, injury, or cancers of the urinary system, so prompt medical assessment is important.

What blood clots in urine can mean

Blood clots in urine mean that bleeding has occurred somewhere along the urinary tract and that the blood has collected enough to form visible clumps or strands. The source may be the kidneys, ureters, bladder, prostate, or urethra. While some causes are temporary and treatable, visible clots are generally a sign that the bleeding should be assessed promptly by a doctor.

Doctors call blood in the urine hematuria. It may be visible to the eye, making urine pink, red, brown, or cola-colored, or it may only be found on a urine test. When clots are present, the amount of bleeding is often greater than with microscopic hematuria, although the exact cause cannot be determined by appearance alone.

Importantly, blood clots in urine are a symptom rather than a diagnosis. They can occur with a simple infection, but they may also be linked to kidney stones, prostate problems, kidney disease, or conditions such as bladder cancer and kidney cancer. A careful medical review helps identify the source and guide the next steps.

How it may look and feel

People describe blood clots in urine in different ways. Some notice stringy or jelly-like pieces in the toilet. Others see small dark red or brown clumps. Urine may remain mostly yellow with a few clots, or it may be pink, red, or tea-colored throughout.

Symptoms can vary depending on the cause. Blood clots may appear with burning during urination, needing to urinate often, lower abdominal pressure, pain in the side or back, or trouble starting the urine stream. Some people have no pain at all, which is one reason visible blood should never be ignored.

Large clots can sometimes block urine flow. This may cause a feeling of fullness in the bladder, difficulty urinating, or sudden inability to pass urine. When this happens, urgent medical care is needed because urinary retention can become painful and may require immediate treatment.

• Pink, red, brown, or cola-colored urine
• Small or larger visible clots
• Burning, urgency, or frequent urination
• Flank, back, pelvic, or lower abdominal pain
• Weak urine stream or inability to pass urine

Common causes and risk factors

There are several possible causes of blood clots in urine. Urinary tract infections can inflame the bladder or kidneys and lead to bleeding. Kidney or bladder stones may scrape the lining of the urinary tract and trigger visible blood. In men, an enlarged prostate can also contribute to bleeding, especially in older age groups.

Bleeding may also come from more serious conditions. Tumors of the bladder, kidney, or prostate can cause visible blood, sometimes without pain. Kidney inflammation, inherited disorders, trauma, strenuous exercise, and some medicines that affect blood clotting can also play a role. Recent urinary procedures, catheter use, or surgery may be additional explanations.

Risk factors depend on the cause, but certain patterns matter. Smoking is a major risk factor for bladder and kidney cancers. Older age, a history of stones, repeated infections, radiation treatment, family history of kidney disease, and use of blood-thinning medication can all increase the likelihood of hematuria. Because the causes range from mild to serious, a doctor usually looks at the whole picture rather than one symptom alone.

Depending on symptoms and age, the doctor may also consider conditions such as prostate cancer or noncancerous prostate enlargement. The goal is not to assume the worst, but to make sure significant causes are not missed.

How doctors diagnose the cause

Diagnosis starts with questions about the timing, amount, and pattern of bleeding. A doctor will ask whether there is pain, fever, recent infection, exercise, injury, or use of blood-thinning medicines. They may also ask about smoking history, kidney stones, prostate symptoms, menstrual bleeding, and any family history of kidney or urinary disease.

A urine test is usually the first step. It can confirm the presence of blood and may show signs of infection, protein, crystals, or other clues. Blood tests may check kidney function, blood counts, and clotting. If infection is suspected, a urine culture can help identify the bacteria.

Imaging is often needed to find the source of bleeding. This may include ultrasound or MRI in selected cases, though computed tomography is commonly used for stones or to evaluate the urinary tract. A specialist may also recommend cystoscopy, a procedure that lets the doctor look directly inside the bladder and urethra, especially if there are clots, repeated episodes, or risk factors for bladder disease.

When the bleeding seems to come from the kidneys themselves, additional tests may be considered. These can include blood pressure assessment, repeat urine studies, and referral to a nephrologist or urologist depending on the findings.

Treatment options for blood clots in urine

Treatment depends on the underlying cause, not just the presence of blood. If an infection is responsible, treatment is directed at clearing the infection. If stones are found, care may focus on pain control, helping the stone pass, or procedures to remove or break it up. For urinary obstruction caused by clots, a catheter may be needed to drain the bladder and wash out retained blood.

When the source is in the bladder, kidneys, or prostate, treatment may involve a urologist. Depending on the findings, this could include monitoring, medications, endoscopic procedures, or surgery. For example, large stones may sometimes be managed with kidney stone treatment, while suspicious bladder findings may need biopsy or removal during cystoscopy.

If the bleeding is linked to an enlarged prostate, kidney disease, or a medication side effect, the plan may include adjusting medicines and treating the underlying condition. If cancer is diagnosed, treatment depends on the type, stage, and overall health of the patient. In that setting, care may include surgery, systemic treatment, or robotic surgery in selected cases.

Near the end of the care journey, patients may benefit from coordinated follow-up. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat urinary tract conditions for international patients, with evaluation tailored to the individual cause of hematuria.

Prevention and self-care

Not every cause of blood clots in urine can be prevented, but some practical steps may lower risk. Drinking enough fluids helps many people reduce the chance of dehydration and may support urinary tract health. Prompt treatment of urinary infections and medical follow-up for recurrent stones or prostate symptoms can also make a difference.

People who have a history of kidney stones may be advised to make diet changes based on the stone type. Those taking blood-thinning medicines should use them exactly as prescribed and should not stop them without medical advice, even if bleeding occurs. Instead, they should contact a healthcare professional promptly for guidance.

Smoking cessation is especially important because smoking raises the risk of cancers that can cause visible blood in urine. Limiting bladder irritants may help symptoms in some people, but self-care should never replace an evaluation when clots are present.

• Stay well hydrated unless a doctor has advised fluid restriction
• Seek care early for burning, fever, or frequent urination
• Attend follow-up for kidney stones, prostate symptoms, or kidney disease
• Avoid smoking and ask for support to quit if needed
• Do not ignore repeat episodes, even if they go away

When to seek medical care

Any episode of blood clots in urine should be discussed with a healthcare professional. Even if the bleeding stops, it still needs assessment because some causes bleed on and off. Many conditions are treatable, and early evaluation can help prevent complications and rule out more serious disease.

Same-day or urgent assessment is important if blood clots in urine are accompanied by severe side or back pain, fever, chills, weakness, dizziness, fainting, or vomiting. Urgent care is also needed if the person cannot pass urine, has worsening lower abdominal pain, or notices heavy bleeding with repeated clots.

People with a history of kidney disease, cancer, urinary procedures, or blood-thinning medication should be especially cautious. Children, older adults, and anyone who is pregnant should also seek medical advice promptly if visible blood appears in the urine.

Frequently asked questions

Are blood clots in urine always serious?

They are not always caused by a dangerous condition, but they are never considered normal. Because clots suggest active bleeding somewhere in the urinary tract, a medical assessment is recommended to find the cause.

Can a urinary tract infection cause blood clots in urine?

Yes, a urinary tract infection can sometimes cause visible blood and occasionally clots, especially if the bladder lining is inflamed. However, clots can also happen for other reasons, so a urine test is often needed.

Do blood clots in urine mean cancer?

Not necessarily. Infections, stones, enlarged prostate, kidney disease, medicines, and injury are also common causes. Still, visible blood in urine can be a sign of urinary tract cancer, so it should be checked promptly.

Should a person go to the emergency department for blood clots in urine?

Emergency care is appropriate if there is severe pain, fever, dizziness, heavy bleeding, or inability to urinate. If the person feels well and the bleeding is mild, they should still arrange prompt medical evaluation.

What tests are usually done for blood clots in urine?

Doctors often start with a urine test and sometimes a urine culture, followed by blood tests if needed. Imaging such as ultrasound or CT and procedures like cystoscopy may be used to look at the kidneys, bladder, and urinary tract.

Can exercise cause blood in urine?

Strenuous exercise can sometimes cause temporary blood in urine, particularly after intense endurance activity. Even so, visible clots are less typical and should not be assumed to be from exercise alone without medical advice.

References

• National Institute of Diabetes and Digestive and Kidney Diseases
• American Urological Association
• National Health Service
• Mayo Clinic
• Urology Care Foundation

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.