Blood in the urine is often ignored. New research suggests that can delay bladder cancer diagnosis

Blood in the urine can be easy to dismiss, especially if it happens once, goes away, or seems to fit another explanation like a urinary tract infection or kidney stone. But a recent study in JAMA Network Open suggests that delayed or incomplete follow-up after hematuria is still common, and that matters because bladder cancer often first shows up this way.

The key point for patients and families is simple: blood in the urine does not automatically mean cancer, but it should not be brushed off.

What hematuria means

Hematuria is the medical term for blood in the urine. It can be:

Visible hematuria, meaning the urine looks pink, red, or cola-colored
Microscopic hematuria, meaning blood cells are found on a urine test even though the urine looks normal

According to MedlinePlus, hematuria has many possible causes. These include urinary tract infections, kidney stones, enlarged prostate, kidney disease, strenuous exercise, some medicines, and cancers of the urinary tract. In other words, hematuria is a warning sign, not a diagnosis by itself.

What the new study found

The new research was an observational study, which means it looked at patterns in real-world care rather than assigning patients to different treatments. That type of study can show where delays or gaps may be happening, but it cannot prove that a delayed workup directly caused a specific person’s cancer outcome.

Even so, the findings are important. The study adds to longstanding concern that some people with hematuria do not get a timely or complete urologic evaluation, particularly when symptoms are first treated as infection or another common condition. When that happens, a more serious cause can be found later than it otherwise might have been.

That does not mean every person with hematuria needs the same tests right away. It does mean unexplained, recurrent, or higher-risk cases should not be left hanging without a follow-up plan.

Why bladder cancer is part of the conversation

Bladder cancer is not the most common cause of hematuria, but it is one of the most important causes to rule out in the right setting. The National Cancer Institute lists blood in the urine as a common symptom. Some people also have pain with urination, frequent urination, or urgent urination, though these symptoms can overlap with infections and other noncancer problems.

In the United States, bladder cancer is more common in older adults and in people with a history of smoking. Smoking is a major risk factor. Other risks can include certain workplace chemical exposures, prior pelvic radiation, chronic bladder irritation, and a personal or family history that changes risk. Men are diagnosed more often than women, although women may be at risk of delayed diagnosis if hematuria is repeatedly attributed to infection.

The American Cancer Society estimates that tens of thousands of Americans are diagnosed with bladder cancer each year. Most cases are not found through population-wide screening. Instead, they are often found after symptoms such as hematuria lead to evaluation.

What proper follow-up can look like

Current U.S. guidance from the American Urological Association and the Society of Urodynamics, Female Pelvic Medicine and Urogenital Reconstruction recommends a risk-based approach, especially for microscopic hematuria. In plain terms, doctors look at factors such as age, smoking history, the amount of blood seen on testing, whether the blood was visible, and other clinical clues.

Depending on the situation, follow-up may include:

Repeat urinalysis if a temporary cause is suspected and symptoms clear
Cystoscopy, a procedure that lets a specialist look inside the bladder with a thin camera
Imaging of the kidneys and urinary tract, which may be an ultrasound or other scan depending on risk level

Not every patient needs cystoscopy or CT imaging. The guideline is designed to avoid both overtesting and undertesting. But visible blood in the urine, repeated unexplained episodes, or hematuria in someone with higher cancer risk generally deserves more attention, not less.

Why infection and stones can complicate the picture

Urinary tract infections and kidney stones are common reasons people see blood in the urine. They can also cause pain, burning, urgency, and other symptoms that feel obvious. The problem is that these conditions do not rule out a second cause, including cancer.

If blood in the urine keeps coming back, does not fully resolve, or was never clearly explained, it is worth asking whether repeat urine testing or referral to a urologist is needed. Repeated treatment for a presumed infection without follow-up can miss a more serious problem.

When to seek prompt medical care

Visible blood in the urine should generally be reported promptly. Faster evaluation is especially important if you also have:

Blood clots in the urine
Trouble urinating or inability to urinate
Fever
Severe back, side, or abdominal pain
Repeated episodes of blood in the urine
Symptoms that do not improve as expected

Microscopic hematuria found on a routine test may not be an emergency, but it still deserves follow-up based on your risk factors and your clinician’s assessment.

Questions to ask if hematuria was found

If you or a family member has been told there is blood in the urine, useful questions include:

Do we know the likely cause, or is it still uncertain?
Should the urine test be repeated after treatment or after a waiting period?
Do my age, smoking history, or other risk factors change the next steps?
Should I see a urologist?
Would cystoscopy or imaging be recommended in my case?

Those questions can help make sure the issue is not forgotten once the immediate symptoms improve.

What this means for readers

The new study does not show that every delay after hematuria leads to cancer, and it does not mean most blood in the urine is caused by bladder cancer. What it does show is that follow-up gaps still happen in real-world care.

For everyday patients, the takeaway is practical: blood in the urine deserves attention, even when there may be a benign explanation. If it is visible, comes back, has no clear cause, or happens in someone with higher bladder cancer risk, make sure there is a plan for follow-up. In some cases that will mean repeat testing. In others, it may mean seeing a urologist for cystoscopy and imaging.

Calm, timely evaluation is the goal, not panic. The main risk is not that every case is cancer. It is that an important warning sign gets ignored.

Sources

This article is for general informational purposes only and is not medical advice. Research findings can be early, limited, or subject to change as new evidence emerges. For personal guidance, diagnosis, or treatment, consult a licensed clinician. For current outbreak or public health guidance, follow your local health department, the CDC, or another relevant public health authority.