Also known as: Hematuria
Blood in the urine, which may appear pink, red, or cola-colored, can be visible to the eye or detected only through a urine test.
Blood in the urine — medically called hematuria — is a symptom that should never be ignored, even when it appears only once or in a very small amount. Urine may appear pink, red, or the color of tea or cola when blood is present in large enough quantities to be seen. This is called gross hematuria. In other cases, blood is present in amounts too small to see but can be detected by a urine dipstick test or microscopic analysis — this is called microscopic hematuria.
The urinary tract includes the kidneys, ureters, bladder, and urethra. Bleeding can occur at any of these points, and the underlying cause can range from a minor, treatable infection to a more serious condition such as a kidney tumor or bladder cancer. Age, sex, and associated symptoms all help guide the diagnostic process.
Because blood in the urine can be caused by many different conditions — some serious — a medical evaluation is always recommended. It is also worth noting that certain foods (such as beets or rhubarb), medications (such as rifampin or some laxatives), and heavy exercise can occasionally cause urine to appear reddish without actual blood being present. A urine test can quickly confirm whether the discoloration is due to blood.
There are several possible reasons you may be experiencing Blood in Urine. Here are the most common ones.
A UTI occurs when bacteria enter and infect the urinary tract, most commonly the bladder and urethra. Inflammation from the infection can irritate and damage the lining of the urinary tract, leading to bleeding that causes pink or reddish urine, along with burning, frequent urination, and sometimes fever.
Kidney stones are hard mineral deposits that form in the kidneys and can travel through the urinary tract. As they move, they can scratch or irritate the inner lining of the ureter or bladder, causing blood to appear in the urine, often alongside severe flank or back pain that may radiate to the groin.
In men, an enlarged prostate gland can press on the urethra, obstructing urine flow and causing irritation in the bladder or urethra. This increased pressure and inflammation can lead to blood in the urine, along with a weak urine stream, difficulty starting urination, or a feeling that the bladder has not fully emptied.
Painless blood in the urine — particularly in older adults or those with a history of smoking — is one of the most important warning signs of bladder or kidney cancer. The bleeding can be intermittent, which makes it easy to dismiss, but any episode of unexplained hematuria should be evaluated to rule out malignancy.
Inflammation of the tiny filtering units of the kidneys (glomeruli), caused by immune conditions, infections, or systemic diseases, can allow blood cells to leak into the urine. This often produces cola-colored or tea-colored urine and may be accompanied by high blood pressure and swelling.
Intense physical activity — such as marathon running — can occasionally cause hematuria, sometimes called 'runner's hematuria' or 'march hematuria.' It may result from trauma to the bladder, dehydration, or the breakdown of red blood cells during exertion. It is usually harmless and resolves with rest and hydration, but should still be evaluated if it recurs.
Blood thinners such as warfarin, aspirin, or certain non-steroidal anti-inflammatory drugs can increase the risk of bleeding throughout the body, including within the urinary tract. If you are on anticoagulant therapy and notice blood in the urine, contact your doctor promptly.
Genetic conditions such as sickle cell anemia and Alport syndrome can affect the kidneys and urinary tract in ways that lead to chronic or recurrent blood in the urine. These conditions are often identified in childhood or adolescence, particularly when there is a family history.
These approaches may help manage blood in urine at home. Always consult a healthcare provider if symptoms persist or worsen.
Drinking plenty of water throughout the day may help flush bacteria and small stone particles through the urinary tract, potentially reducing irritation and bleeding. Adequate hydration is one of the simplest and most effective ways to support urinary tract health.
Reducing or eliminating caffeine, alcohol, spicy foods, and artificial sweeteners may help reduce bladder irritation, especially if you have a UTI or overactive bladder contributing to the problem. Some people find that these changes provide noticeable relief.
Some research suggests that cranberry juice or supplements may help prevent certain bacteria from adhering to the urinary tract wall, potentially reducing the risk of recurrent UTIs. However, cranberry products are not a substitute for antibiotics when a UTI is already present.
If blood in the urine appears after strenuous physical activity, taking a break from intense exercise and drinking extra fluids may allow the bleeding to resolve. If it does not clear within a day or two, or if it recurs, a medical evaluation is important.
A healthcare provider will typically begin with a urinalysis to confirm the presence of blood cells in the urine and look for signs of infection, such as bacteria or white blood cells. A urine culture may be ordered to identify any infecting organism. Imaging studies — such as an ultrasound, CT scan, or MRI of the kidneys and urinary tract — are often used to look for stones, tumors, or structural abnormalities. In some cases, a cystoscopy — a procedure using a small camera inserted through the urethra — may be performed to directly examine the inside of the bladder. Blood tests to check kidney function may also be requested.
Any visible blood in the urine should be evaluated by a healthcare provider, even if it occurs only once.
Steps you can take to reduce the likelihood of experiencing blood in urine.
Drink at least 6 to 8 glasses of water per day to keep the urinary tract flushed and reduce the risk of infections and kidney stone formation.
Urinate after sexual intercourse to help clear bacteria that may have entered the urethra, reducing the risk of UTIs, particularly in women.
Avoid holding urine for long periods, as this can allow bacteria to multiply in the bladder.
If you smoke, quitting is one of the most important steps you can take to reduce your risk of bladder cancer, which is strongly linked to smoking.
Follow up with your doctor for regular monitoring if you have known risk factors for kidney disease, such as diabetes, high blood pressure, or a family history of kidney problems.
You should seek emergency care if blood in the urine is accompanied by severe pain, fever and chills, difficulty urinating, large blood clots, or if you are on blood-thinning medications. For blood in the urine without these urgent symptoms, schedule a prompt appointment with your doctor — ideally within a day or two.
Yes, UTIs can cause visible blood in the urine — this is called gross hematuria. The inflammation and irritation of the urinary tract lining caused by a bacterial infection can lead to small amounts of bleeding. Treating the UTI with the appropriate antibiotic typically resolves the bleeding within a few days.
Not always. Painless blood in the urine is actually common and can be caused by conditions such as bladder cancer, kidney tumors, or certain kidney diseases. Because painless hematuria can be a sign of something serious, it is particularly important not to dismiss it just because it does not cause discomfort.
Yes, strenuous exercise — especially long-distance running or contact sports — can occasionally cause hematuria. This is generally temporary and resolves with rest. However, because other causes cannot be ruled out without testing, exercise-related hematuria that is recurrent or does not resolve within 24 to 48 hours should be evaluated by a doctor.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.