Learn About Hematuria and Your Health

What Is Hematuria and Why It Matters

Hematuria is the medical term for blood in your urine. This condition can range from something minor that resolves on its own to a sign of a serious underlying health issue. Understanding what hematuria is and recognizing its symptoms can help you make informed decisions about your health and know when to contact a healthcare provider.

There are two main types of hematuria: gross hematuria and microscopic hematuria. Gross hematuria means you can see the blood in your urine with your naked eye. Your urine may appear pink, red, or cola-colored. This type is often noticeable and may prompt people to seek medical attention quickly. Microscopic hematuria means there is blood in your urine, but it is not visible to the naked eye. Instead, it is detected during a urinalysis test performed by a healthcare provider. Many people have microscopic hematuria without knowing it until a routine test reveals it.

Blood in urine can originate from anywhere in the urinary system, which includes the kidneys, ureters (tubes connecting kidneys to the bladder), bladder, and urethra (the tube through which urine exits the body). Depending on where the blood comes from, the color and pattern of bleeding can differ. Additionally, the amount of blood present does not always indicate the severity of the underlying cause. A small amount of visible blood can sometimes indicate a serious condition, while a large amount might result from a minor problem.

Statistics show that hematuria affects a significant portion of the population at some point. Approximately 2 to 3 percent of people experience gross hematuria during their lifetime, while microscopic hematuria is found in about 2 to 13 percent of the population depending on screening methods used. This means hematuria is relatively common, though not everyone who experiences it will have a serious condition.

Practical Takeaway: Pay attention to changes in your urine color or appearance. If you notice blood in your urine, even if it happens only once, note when it occurred, how long it lasted, and whether you experienced any other symptoms. This information can be valuable when discussing your health with a provider.

Common Causes of Hematuria

Hematuria can stem from many different causes, ranging from urinary tract infections to kidney disease to certain medications. Identifying the cause is an important step in determining the right course of action and whether further evaluation is needed. Some causes are temporary and resolve without treatment, while others require ongoing management.

Urinary tract infections (UTIs) are among the most common causes of hematuria, particularly gross hematuria. UTIs occur when bacteria enter and multiply in the urinary system. They are more common in women than men and can cause blood in urine along with symptoms like pain or burning during urination, urgency to urinate, and cloudy or foul-smelling urine. Most UTIs respond well to antibiotic treatment, and the hematuria typically disappears once the infection clears.

Kidney stones represent another frequent cause of visible blood in urine. These are hard mineral deposits that form in the kidneys and can range in size from a grain of sand to a golf ball. As stones move through the urinary tract, they can scratch and irritate the lining, causing bleeding and severe pain. People with kidney stones often experience sharp pain in the back or side, nausea, and frequent urination. Some stones pass naturally through the urine, while others may require medical intervention.

Bladder or kidney infections beyond simple UTIs can also cause hematuria. Pyelonephritis is a more serious kidney infection that can cause fever, back pain, and blood in the urine. Cystitis is inflammation of the bladder and can similarly produce hematuria along with urinary urgency and pelvic discomfort.

Enlarged prostate glands, which commonly affect older men, can cause microscopic or gross hematuria. As the prostate enlarges with age, it can press on the urethra and irritate the bladder lining, leading to bleeding. Medications like blood thinners, including warfarin and aspirin, can increase bleeding throughout the body, including in the urinary tract, making hematuria more likely to occur.

Strenuous exercise, particularly long-distance running, can sometimes cause temporary hematuria. This condition, sometimes called runner's hematuria, occurs when intense physical activity irritates the bladder or causes minor trauma to the urinary tract. The bleeding typically stops within 24 to 48 hours after rest.

More serious causes include kidney disease, glomerulonephritis (inflammation of the kidney's filtering units), bladder or kidney cancer, polycystic kidney disease, and certain inherited bleeding disorders. While these conditions are less common causes of hematuria, they highlight why investigating the cause is important.

Practical Takeaway: Make a list of any medications you take, recent illnesses, intense physical activities, or other events that occurred around the time you noticed hematuria. Share this timeline with your healthcare provider, as it can help narrow down the possible causes.

When to Contact a Healthcare Provider

Knowing when to seek medical attention for hematuria can help ensure that serious conditions are caught early and that minor issues are properly managed. While not every instance of blood in urine requires emergency care, certain situations warrant prompt evaluation by a healthcare provider.

You should contact a healthcare provider if you notice any visible blood in your urine, even if it occurs only once. This is particularly important if the hematuria is accompanied by other symptoms. Pain or burning during urination, especially combined with blood in the urine, often suggests a UTI or bladder inflammation. Fever accompanying hematuria may indicate an infection that requires treatment. Back or side pain combined with hematuria could signal kidney stones or kidney infection. Unexplained weight loss, fatigue, or night sweats occurring alongside hematuria warrant investigation for more serious conditions.

Seek emergency medical care if you experience severe back or abdominal pain with hematuria, as this could indicate a serious kidney condition or passing kidney stone causing obstruction. Heavy bleeding with blood clots in the urine also requires prompt evaluation. If you are on blood thinning medications and suddenly develop hematuria, contact your healthcare provider or pharmacist immediately, as your medication dosage may need adjustment.

Microscopic hematuria discovered during a routine urinalysis should not be ignored, even though you cannot see it yourself. Your provider may want to repeat the test, run additional tests, or monitor the situation over time. This is especially true if you have risk factors for kidney disease, such as diabetes or high blood pressure.

Age matters in evaluating hematuria. Adults over 50 who experience unexplained hematuria require more thorough investigation due to increased risk of bladder and kidney cancer in older populations. Similarly, if you have a family history of kidney disease or inherited conditions affecting the kidneys, hematuria warrants professional evaluation.

Duration of hematuria also influences when to seek care. If blood in your urine persists for more than a few days or keeps recurring, schedule an appointment with your healthcare provider. Persistent hematuria may indicate an ongoing problem that requires investigation rather than a one-time event.

Practical Takeaway: Keep a log of any hematuria episodes, noting the date, whether it was visible or discovered through testing, associated symptoms, and how long it lasted. Bring this record to your healthcare appointment to provide your provider with a clear picture of the pattern.

Diagnostic Tests and What to Expect

If you have hematuria, your healthcare provider will likely perform several tests to determine the cause. Understanding what these tests involve and what they can reveal helps you feel more prepared during your evaluation. The process typically starts with basic tests and may advance to more specialized imaging if needed.

The urinalysis is usually the first test performed. This involves providing a urine sample, which is then examined under a microscope to check for the presence of red blood cells, white blood cells, bacteria, and other substances. The urinalysis can reveal infection, crystals that might indicate kidney stones, or protein that could suggest kidney disease. The test takes only a few days for results, making it a quick way to gather initial information.

A urine culture may be ordered if infection is suspected. This test involves growing any bacteria present in your urine sample in a laboratory setting. Results typically take 48 to 72 hours