Blood in Urine

What is blood in urine?

Blood in urine, known medically as hematuria, means that red blood cells are present in the urine. Sometimes the blood is visible and turns the urine pink, red, or brown; this is called gross hematuria (blood you can see). In other cases, the blood can only be detected under a microscope or with a urine test strip; this is called microscopic hematuria (blood you cannot see). Under the international classification of diseases, unspecified hematuria is coded as ICD-10 R31.9.

It is important to understand what is blood in urine from a medical standpoint: it is a sign, not a disease in itself. Blood in urine has many possible causes, ranging from harmless and temporary issues, such as vigorous exercise or a minor urinary tract infection, to more serious conditions, such as kidney disease, kidney stones, or, less commonly, tumors of the urinary tract. Because the cause cannot be identified by appearance alone, any episode of blood in urine deserves medical evaluation.

Blood in urine can affect people of any age and any sex. It is relatively common: many people will have at least one episode of visible or microscopic hematuria during their lifetime. Certain groups are more likely to experience it or to have a more serious underlying cause, including older adults, people who smoke, men with prostate enlargement, and people with a history of kidney stones or urinary tract infections. In women, apparent blood in urine sometimes actually comes from menstrual bleeding, which is why the timing of testing matters.

Symptoms of blood in urine

Blood in urine symptoms depend on whether the bleeding is visible and on what is causing it. Some people notice a dramatic change in urine color, while others have no symptoms at all and only learn about the blood after a routine urine test.

Common signs and accompanying symptoms include:

• Pink, red, or cola-colored urine — the most recognizable sign of visible (gross) hematuria. Even a small amount of blood can noticeably change urine color.
• Blood clots in the urine — small clots may appear and can occasionally cause discomfort or difficulty passing urine.
• Burning or pain when urinating — often seen when a urinary tract infection (an infection of the bladder, urethra, or kidneys) is the cause.
• Frequent or urgent need to urinate — common with infections and bladder irritation.
• Pain in the side, back, or lower abdomen — flank pain (pain in the side between the ribs and hip) may suggest kidney stones or a kidney problem.
• No symptoms at all — microscopic hematuria typically causes no noticeable changes and is found only on testing.

How the blood appears during urination can offer clues, although only testing can confirm the source. Blood mainly at the start of the urine stream often points to the urethra (the tube that carries urine out of the body). Blood mainly at the end of the stream may suggest the bladder neck or, in men, the prostate. Blood mixed evenly throughout the urine can come from the bladder, the ureters (the tubes connecting the kidneys to the bladder), or the kidneys themselves.

Painless visible blood in urine deserves particular attention. While pain often accompanies infections and stones, bleeding without pain can sometimes be the first sign of a bladder or kidney tumor, especially in older adults and people who smoke. This does not mean painless bleeding always indicates something serious — in many cases it does not — but it should never be ignored or assumed to be harmless simply because it does not hurt.

It is also worth knowing that some foods (such as beets and rhubarb), food dyes, and certain medications can turn urine red or orange without any blood being present. Only a urine test can distinguish true hematuria from harmless discoloration.

Causes and risk factors

Blood in urine causes are numerous, and identifying the correct one is the main goal of medical evaluation. Common causes include:

• Urinary tract infections (UTIs) — bacterial infections of the bladder or urethra are among the most frequent causes, particularly in women. Kidney infections (pyelonephritis) can also cause bleeding, often with fever and back pain.
• Kidney stones and bladder stones — hard mineral deposits can scrape the lining of the urinary tract as they move, causing bleeding that is often accompanied by severe, cramping pain.
• Enlarged prostate (benign prostatic hyperplasia) — in men, a noncancerous enlargement of the prostate gland can compress the urethra and cause bleeding, along with difficulty urinating.
• Kidney disease — inflammation of the kidney’s filtering units (glomerulonephritis) can allow blood to leak into the urine, sometimes together with protein.
• Cancer — tumors of the bladder, kidney, or prostate can cause hematuria. Bleeding is often painless in the early stages, which is one reason evaluation is important.
• Injury — a blow to the kidneys or bladder, or trauma from a medical procedure such as catheter placement, can cause temporary bleeding.
• Strenuous exercise — intense physical activity, especially long-distance running, can cause short-lived hematuria that usually resolves with rest.
• Medications — blood thinners (anticoagulants), aspirin, and some other drugs can make bleeding more likely or unmask bleeding from another cause.
• Inherited conditions — disorders such as sickle cell disease and certain inherited kidney conditions can cause blood in urine.

Several factors increase the risk of hematuria or the likelihood that it reflects a more serious cause:

• Age — the risk of prostate enlargement and urinary tract cancers rises with age, particularly after 50.
• Smoking — tobacco use is a well-established risk factor for bladder and kidney cancer.
• Occupational chemical exposure — long-term exposure to certain industrial chemicals, such as those used in dye, rubber, and paint manufacturing, is associated with bladder cancer risk.
• History of urinary problems — previous kidney stones, recurrent infections, or radiation therapy to the pelvis increase risk.
• Family history — a family history of kidney disease or urinary tract cancers may be relevant.

Importantly, taking a blood thinner does not by itself explain hematuria. Doctors generally recommend that people on these medications who develop blood in urine still be evaluated, because the medication may simply reveal bleeding from an underlying condition.

Diagnosis

Blood in urine diagnosis begins with confirming that blood is truly present and then working to find its source. Your doctor will usually take a detailed history — asking about symptoms, medications, smoking, recent exercise, infections, and family history — and perform a physical examination.

Common tests and investigations include:

• Urinalysis — a laboratory examination of a urine sample. A dipstick test can detect blood chemically, and microscopic examination confirms whether intact red blood cells are present and looks for signs of infection, protein, or abnormal cells. Because a single dipstick result can be misleading, doctors often repeat the test.
• Urine culture — if infection is suspected, a culture identifies the bacteria involved and helps guide antibiotic choice.
• Blood tests — tests of kidney function (such as creatinine) and blood counts help assess overall kidney health and rule out anemia or clotting problems.
• Imaging — a CT urogram (a specialized CT scan of the kidneys, ureters, and bladder using contrast dye) is often used to look for stones, tumors, or structural abnormalities. Ultrasound may be used instead, particularly in younger patients, in pregnancy, or when radiation exposure should be limited.
• Cystoscopy — a procedure in which a thin, flexible tube with a camera is passed through the urethra to directly inspect the inside of the bladder. This is often recommended for adults with unexplained hematuria, especially those over a certain age or with risk factors for bladder cancer.
• Urine cytology — microscopic examination of urine for abnormal cells, sometimes used alongside cystoscopy.

The extent of testing depends on individual risk. A young, healthy person with a clear-cut urinary infection may only need urinalysis and a culture, with a follow-up test to confirm the blood has cleared. An older adult with painless visible bleeding will usually be advised to have both imaging and cystoscopy. If kidney disease is suspected — for example, when the urine also contains protein or kidney function is reduced — referral to a kidney specialist (nephrologist) and, occasionally, a kidney biopsy may be recommended.

In many hospitals, including Acibadem, the evaluation of hematuria is coordinated by the urology department, which specializes in conditions of the kidneys, bladder, prostate, and urinary tract.

Treatment options

Blood in urine treatment depends entirely on the underlying cause. There is no single treatment for hematuria itself; instead, doctors treat the condition responsible for the bleeding. In some cases, when thorough evaluation finds no cause and no signs of disease, no treatment is needed at all beyond periodic follow-up.

Watchful waiting and monitoring

If tests do not reveal a serious cause — which happens in a meaningful proportion of cases — your doctor may recommend observation with repeat urine tests over time. Exercise-related hematuria typically resolves on its own with rest, and follow-up testing simply confirms the urine has cleared. For persistent unexplained microscopic hematuria, periodic monitoring helps ensure that nothing new develops.

Medication

When an infection is the cause, a course of antibiotics usually clears both the infection and the bleeding, with a follow-up urine test to confirm. Men with an enlarged prostate may be offered medications that relax or shrink the prostate to relieve pressure on the urethra. If a blood thinner is contributing, your doctor may review the dose or the medication — but you should never stop a prescribed blood thinner on your own, as this can be dangerous.

Procedures

Kidney stones that do not pass on their own may be treated with procedures such as shock wave lithotripsy (using focused sound waves to break stones into smaller fragments) or ureteroscopy (passing a thin instrument up the urinary tract to remove or fragment stones). Small bladder tumors or bleeding areas can often be treated during cystoscopy using instruments passed through the same scope.

Surgery

Some causes require surgery. Examples include removal of large stones, surgical treatment of significant prostate enlargement, or operations to remove tumors of the bladder or kidney. The specific approach — including whether minimally invasive techniques are suitable — depends on the diagnosis, the location and extent of the problem, and your overall health. Conditions requiring procedural or surgical treatment are generally managed by urology specialists, and cancer care typically involves a multidisciplinary team.

Treating kidney disease

If glomerulonephritis or another kidney disease is found, treatment may involve blood pressure control, medications that reduce inflammation or suppress the immune system, and careful long-term monitoring of kidney function by a nephrologist.

Living with blood in urine and outlook

The outlook for someone with blood in urine depends almost entirely on the cause. In many cases, the cause is benign and fully treatable: infections respond to antibiotics, most kidney stones pass or can be removed, and exercise-related bleeding resolves on its own. When evaluation finds no cause, most people do well, although doctors may recommend occasional repeat testing as a precaution.

When hematuria is caused by a more serious condition such as kidney disease or cancer, early detection generally allows more treatment options. This is one of the strongest reasons not to dismiss an episode of visible blood, even if it happens only once and then disappears — intermittent bleeding is common with some serious conditions, and a single episode still warrants evaluation.

Practical steps that may support urinary tract health include:

• Drinking enough fluids, which helps flush the urinary tract and may reduce the risk of stones and infections.
• Not smoking, or seeking support to quit, since smoking is a major risk factor for bladder and kidney cancer.
• Attending recommended follow-up appointments and repeat urine tests, even if you feel well.
• Telling your doctor about all medications and supplements you take, especially blood thinners.
• Seeking prompt care for urinary symptoms such as burning, urgency, or fever, so infections are treated early.

No lifestyle measure can guarantee that hematuria will not recur, but these steps support overall urinary health and make it easier for your care team to detect any changes early.

Frequently asked questions

What is blood in urine and is it always serious?

Blood in urine, or hematuria, means red blood cells are present in the urine, either visibly or detectable only under a microscope. It is not always serious — common causes include infections, stones, and vigorous exercise — but because it can occasionally signal kidney disease or cancer, every episode should be evaluated by a doctor rather than assumed to be harmless.

Can blood in urine go away on its own?

Yes, in some cases it can. Bleeding caused by strenuous exercise or a minor irritation often resolves without treatment, and infection-related bleeding clears once the infection is treated. However, bleeding that stops on its own does not rule out a serious cause, because some conditions bleed intermittently. Evaluation is still recommended even if the urine returns to normal.

How serious is blood in urine without pain?

Painless visible blood in urine should be taken seriously, particularly in adults over 50 and in people who smoke, because it can occasionally be the first sign of a bladder or kidney tumor. In many cases the cause turns out to be benign, but painless bleeding is generally considered a stronger reason for thorough evaluation, not a reassuring sign.

What tests are used for blood in urine diagnosis?

Doctors typically start with urinalysis to confirm the blood and look for infection or protein, along with blood tests of kidney function. Depending on your age, risk factors, and symptoms, they may recommend imaging such as a CT urogram or ultrasound, and cystoscopy, a camera examination of the bladder. The combination of tests depends on your individual situation.

What does blood in urine treatment involve?

Treatment targets the underlying cause rather than the blood itself. Options range from watchful waiting when no cause is found, to antibiotics for infections, medications for prostate enlargement, procedures for kidney stones, and surgery for tumors or structural problems. Your doctor will recommend an approach based on the diagnosis and your overall health.

Can foods or medications make urine look like it contains blood?

Yes. Beets, rhubarb, some berries, food dyes, and certain medications can turn urine red, pink, or orange without any blood being present. Only a urine test can tell the difference, so it is still worth having discolored urine checked rather than assuming a food is responsible.

Do I need to see a specialist for blood in urine?

Many people are first evaluated by their primary care doctor, who can perform initial urine and blood tests. If the cause is unclear, if imaging or cystoscopy is needed, or if a condition such as stones, prostate disease, or a tumor is suspected, referral to a urologist is common. If kidney disease is suspected, a nephrologist may also be involved.

When to see a doctor

Any episode of visible blood in urine should prompt a medical appointment, even if it happens only once and causes no pain. Microscopic hematuria found on a routine test should also be followed up as your doctor advises.

Seek urgent medical care if blood in urine occurs together with any of the following red-flag warning signs:

• Inability to urinate, or blood clots blocking the flow of urine.
• Severe pain in the side, back, or lower abdomen, which may indicate a kidney stone or kidney problem.
• Fever, chills, or nausea and vomiting, which may signal a kidney infection.
• Heavy bleeding, urine that looks mostly like blood, or dizziness, weakness, or fainting suggesting significant blood loss.
• Blood in urine after an injury to the abdomen, back, or pelvis.
• Blood in urine while taking blood thinners, especially if the bleeding is heavy or persistent — do not stop the medication on your own, but seek prompt advice.

Prompt evaluation gives your care team the best chance of identifying the cause early and treating it effectively. Even when the eventual explanation is benign, confirming this through proper testing provides reassurance and helps protect your long-term urinary and kidney health.