Blood in Urine: Common Causes, Tests, and When to See a Urologist

Blood in urine, also called hematuria, is a sign that should be checked even when it happens only once or causes no pain. Many causes are treatable, and simple urine tests, imaging, and specialist evaluation can usually identify the source.

Overview

Blood in urine is medically called hematuria. It can be visible to the eye, changing urine to pink, red, cola-colored, or tea-colored, or it can be microscopic, meaning the red blood cells are found only during a urinalysis. Either type deserves medical attention because urine normally should not contain blood.

Hematuria is not a diagnosis by itself. It is a sign that bleeding is occurring somewhere along the urinary tract, which includes the kidneys, ureters, bladder, prostate in men, and urethra. In many people, the cause is a urinary tract infection, kidney stone, recent exercise, or another treatable condition.

At the same time, doctors take hematuria seriously because it can occasionally be linked to kidney disease or tumors of the bladder, kidney, or prostate. A calm, step-by-step evaluation helps avoid unnecessary worry while making sure important causes are not missed.

What Blood in Urine Can Look and Feel Like

Visible blood may make the urine look light pink, bright red, rusty, brownish, or the color of tea. The color does not always show how serious the cause is; even a small amount of blood can noticeably change urine color. Some people also notice small clots, which are more likely to come from the lower urinary tract, such as the bladder or prostate.

Hematuria may occur with other urinary symptoms. These can include burning or pain while urinating, needing to urinate more often, urgency, lower abdominal discomfort, flank or back pain, fever, or difficulty starting the urine stream. In other cases, there are no symptoms at all, and blood is found during a routine checkup.

Not every red or dark urine color is caused by blood. Beets, blackberries, some food colorings, dehydration, and certain medicines can change urine color. However, because it is difficult to tell by appearance alone, anyone who sees a red or brown urine change should arrange a urine test rather than trying to guess the cause.

Common Causes and Risk Factors

Urinary tract infections are among the most common causes of blood in urine, especially when hematuria comes with burning, urgency, frequent urination, pelvic discomfort, or fever. Kidney infections may also cause flank pain and feeling unwell. A urine culture can identify bacteria and guide treatment when infection is suspected.

Kidney stones or ureter stones can scratch the lining of the urinary tract and cause bleeding. Stones may lead to waves of severe side or back pain, nausea, vomiting, and blood in the urine, but some stones cause only mild symptoms. Bladder stones can also cause irritation, pain, or interrupted urine flow.

In men, prostate enlargement, prostatitis, or prostate procedures may cause hematuria. Other possible causes include recent vigorous exercise, trauma, catheter use, inherited kidney conditions, glomerulonephritis, and medications that increase bleeding tendency, such as blood thinners. People should not stop prescribed medicines on their own; a doctor can assess whether a medication is contributing.

Risk factors that may lead a doctor to recommend a more detailed urology evaluation include age over 35 to 40, smoking history, repeated visible hematuria, occupational chemical exposure, prior pelvic radiation, recurrent urinary infections, or a personal or family history of urinary tract cancer or kidney disease.

Tests Used to Diagnose Hematuria

The first test is usually a urinalysis. This checks whether red blood cells are truly present and looks for signs of infection, protein, crystals, or kidney inflammation. A urine culture may be ordered if infection is possible, and a repeat urine test may be needed because hematuria can come and go.

Blood tests can help assess kidney function, inflammation, anemia, and clotting problems. Depending on the symptoms and the patient’s age and risk factors, doctors may request imaging such as kidney and bladder ultrasound, CT urography, or other CT scans. Imaging can identify stones, blockage, tumors, structural changes, or kidney abnormalities.

A urologist may recommend cystoscopy, especially for visible blood in urine or persistent unexplained microscopic hematuria. During cystoscopy, a thin camera is passed through the urethra to view the bladder lining and urethra. Local anesthetic is often used, and the test helps detect bladder stones, tumors, inflammation, narrowing, or bleeding sites that imaging may not show.

Sometimes evaluation also involves urine cytology, which checks urine cells under a microscope, or referral to a kidney specialist if the pattern suggests kidney tissue disease. The right combination of tests is individualized, balancing accuracy with the person’s symptoms and risk profile.

Treatment Options

Treatment depends entirely on the cause. If a bacterial urinary tract infection is confirmed, antibiotics may be prescribed, and symptoms often improve with appropriate therapy. A follow-up urine test may be recommended to confirm that blood has cleared, especially if the person is older, male, pregnant, or has recurrent infections.

Kidney stones may pass with fluids, pain control, and medical observation when they are small and safe to monitor. Larger stones, infected stones, or stones causing blockage may require procedures such as shock wave lithotripsy, ureteroscopy, or other urologic treatments. The choice depends on stone size, location, kidney function, and overall health.

For prostate-related hematuria, treatment may include medicines, infection treatment, monitoring, or procedures to improve urinary flow if enlargement is significant. If bladder, kidney, or prostate cancer is found, the treatment plan may involve surgery, endoscopic procedures, medicines, radiation, or a combination, guided by the tumor type and stage.

When blood in urine is linked to kidney inflammation or a systemic condition, care may involve a nephrologist and targeted treatment for the underlying disease. Because causes vary widely, self-treatment is not recommended beyond hydration and avoiding known irritants until a qualified clinician provides guidance.

Prevention and Self-Care

Not all causes of hematuria can be prevented, but healthy urinary habits may reduce the risk of infections, stones, and irritation. Drinking enough water, not delaying urination for long periods, and seeking care for urinary symptoms can support bladder and kidney health. People prone to stones may need personalized dietary advice after stone analysis or metabolic testing.

Useful everyday measures include:

• Staying well hydrated, especially in hot weather or during exercise.
• Limiting excess salt if advised, because high salt intake can contribute to some kidney stones and blood pressure problems.
• Avoiding tobacco, which is a major risk factor for bladder and kidney cancers.
• Using medicines, including anti-inflammatory drugs and blood thinners, only as directed.
• Managing diabetes, high blood pressure, and recurrent infections with regular medical follow-up.

People who notice blood after intense exercise should still mention it to a doctor, particularly if it recurs or lasts beyond a short time. Exercise-related hematuria may be benign, but persistent or repeated episodes need evaluation to exclude other causes.

When to See a Urologist

Visible blood in urine should be discussed with a doctor promptly, even if it appears once and then disappears. A urologist should also evaluate repeated microscopic hematuria, blood with clots, urinary blockage, unexplained weight loss, recurrent urinary infections, or hematuria in someone with smoking history or other risk factors.

Urgent medical care is needed if blood in urine occurs with fever, severe side or back pain, vomiting, inability to urinate, heavy bleeding with clots, dizziness, or after a significant injury. These symptoms may indicate infection with blockage, a stone complication, or another condition that needs timely treatment.

Patients should bring a list of medicines and supplements, recent test results, details about urine color, pain, fever, and whether symptoms are new or recurring. If care is being sought abroad, Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals can diagnose and treat urologic causes of hematuria for international patients.

Frequently asked questions

Is blood in urine always serious?

Blood in urine is not always caused by a serious condition, but it should always be checked. Infections, stones, and exercise-related irritation are common and often treatable. A urine test and medical review help determine whether further evaluation is needed.

Can a urinary tract infection cause blood in urine?

Yes. A urinary tract infection can irritate the bladder or kidneys and lead to blood in urine, often with burning, urgency, frequent urination, or pelvic discomfort. A urine culture can confirm infection and guide the correct antibiotic when needed.

What does microscopic hematuria mean?

Microscopic hematuria means red blood cells are present in the urine but cannot be seen by the eye. It is usually found during a routine urinalysis. If it persists or occurs in someone with risk factors, doctors may recommend imaging and urology evaluation.

Can kidney stones cause blood without much pain?

Yes. Some kidney stones cause severe cramping pain, while others cause mild discomfort or only blood in the urine. Imaging tests can help find stones and show whether they are causing blockage or need treatment.

Should people taking blood thinners worry about hematuria?

Blood thinners can make bleeding more noticeable, but they do not always explain why bleeding started. People should not stop prescribed blood thinners without medical advice. A doctor can check for urinary tract causes and adjust medication only if appropriate.

When is cystoscopy needed for blood in urine?

Cystoscopy may be recommended for visible blood in urine, persistent unexplained microscopic hematuria, or higher-risk patients. It allows the urologist to look directly inside the bladder and urethra. The test can detect problems that may not be visible on ultrasound or other imaging.

References

• American Urological Association
• European Association of Urology
• National Institute of Diabetes and Digestive and Kidney Diseases
• Mayo Clinic
• Cleveland Clinic

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.